/sqt/ stupid questions thread

[Anonymous No.9929447]

Eternal stupid question thread / QTDDTOT questions that don't deserve their own thread

Ask all your (brainlet) questions

[Anonymous No.9929469]

>>9929447
So I am a newfag. Where the fuck did brainlet come from?

[Anonymous No.9929576]

>>9929469
It all started on /fit/ with manlets, that is, "men" that are not tall enough to be considered as such (5"10 and below). In some way, these people are deficient in what being a man is. Consequently, the genii of /sci/ conjured the intellectual equivalent of what a man is to a manlet, the brainlet, a person whose brain is just not capable of abstract thought and logic.

[Anonymous No.9929605]

how badly do analog signals get corrupted when traveling through the void of space?
stupid example: if I had a really big wifi antenna, and I could supply it with enough power to send signals to mars, maybe pluto, how much damage would the signal sustain before arriving at the recipient? would you need hella redundancy in there to make sense of the message?

[Anonymous No.9929617]

>>9929576
Thank you.

[Anonymous No.9929688]

>>9929605
not much. the hardest part is getting it through earth's atmosphere

[Anonymous No.9929703]

whats the best self learning regiment for lazy neets

[Anonymous No.9929722]

>>9929703
1. get a full sized mirror so that you can see your whole body
2. get naked
3. stare at yourself in the mirror for 20 minutes without doing or thinking anything other than on yourself
4. ???
5. profit

[Anonymous No.9929908]

What software do I use to make models like these?
There's a list on wikipedia for "Molecular Graphics Systems" but I want to know which is the best/most used?

[Anonymous No.9930221]

>>9929447
Could someone explain globular categories to me? Nothing really comes up when I Googled it.

[Anonymous No.9930223]

>>9929576
Where did the "let" suffix come from? I always thought it was a portmanteau of "man" and "piglet".

[Anonymous No.9930258]

I would like to teach myself physics, chemistry, and biology. As both chemistry and biology are based on physics, I was thinking of learning it first, then chem, then bio. However, just in case, is their any reason to use a different order?

[Anonymous No.9930305]

>>9930258
Ah but all of physics is built on mathematics, so you must learn it first.

[Anonymous No.9930465]

can you represent conway's game of life as a differential equation?

[Anonymous No.9930487]

>>9929447
So I’m just starting group theory and am going on a limb here but: is there any proof that there can’t be a general formula for the zeroes of quintic or higher polynomials?

I know there exists a proof that there can’t be a general quintic or higher using only algebraic functions, addition, subtraction, radicals, etc . However from my understanding nothing seems to stop us from making a general formula for the zeroes using non algebraic functions: logarithms and trig. Is this possible?

[Anonymous No.9930602]

Im an incoming physics freshman at an okay university. Kinda asking to be spoonfed here but what the hell should i be doing year by year if i wanna end up getting a PhD from a top university? I took a lot of college classes in high school through a concurrent enrollment thing so I got calc 1-3 and physics 1 n 2 out of the way early which probably helps but im not too sure what extra stuff i can be doing during my undergrad semesters to really stand out.

[Anonymous No.9930612]

>>9930223
It's a general diminutive suffix https://en.wiktionary.org/wiki/-let#English

[Anonymous No.9930618]

>>9929447
Is consciousness ontologically basic?

[Anonymous No.9930622]

>>9930487
well, yeah for obvious reasons, but it's not a satisfying thing to have an infinite formulas since you will most likely require infinite steps. For any real number there is a rational approximation so you can use that. Alternatively, something like Newton's method gives an (infinite) formula of the roots of the polynomial you seek.

[Anonymous No.9930631]

>>9930602
1. Research experience: go to your favourite professor that does your favorite subject and ask if there's any research you can do

2. Take as many graduate level classes as you can (in a reasonable way, don't pick 6 graduate modules, maybe 1-2 and see how you manage) and EXCEL in them.

3. Be a valedictorian, or something of the like. Try to earn awards for your achievements, by being first of the class, or best UG research, etc.

[Anonymous No.9930700]

If the time is not discrete, then how do we take a photos?
If you want to take pictures of something, how many photo can you take in 1 second in theory? Can you think up any theoretical limit? Based on the limit of speed or uncertainty principle or shit, idk.

[Anonymous No.9930717]

>>9930487
There's a closed-form solution for quintics in terms of Bring radicals.

[Anonymous No.9930872]

>>9929605
You might want to avoid TCP though. Or be wary of any latency demands the used protocols pose.

[Anonymous No.9930880]

>>9930700
Limit would probably be catching all Photons that come into contact with the object (while not obstructing the light source?

[Anonymous No.9930881]

are black colored LDPE bags better than clear colored LDPE bags? are they more UV resistant? do they protect the contents inside the bag better?

[Anonymous No.9930886]

>you throw a n times 6 faced dice
Among all the possible results, how many realisations have the same number twice?

[Anonymous No.9930915]

>total thickness: 50 micrometers
>total
wtf is the actual thickness 25 micrometers or is it just the seller being a lazy hackjob as usual

[Anonymous No.9930937]

>>9930618
>Is consciousness ontologically basic?
>ontology
>science
pick one

[Anonymous No.9930983]

>>9930881
Consult your manufacturer.

[Anonymous No.9931031]

>>9930983
bih i'm small time nigga i ain't got manufacturers just for packaging

i would buy 100 bags from staples but the local store closed like shiet

i'll have to order 1000 bags even tho i only need 100 or 200 rn because the local stores suck

[Anonymous No.9931037]

i ordered 1000 cheap tiny ass bags before but now i need a bigger size too that isn't as cheap dammit

[Anonymous No.9931039]

but i'll go with the clear bags they're cheaper and they'll be ok probably

[Not anon No.9931052]

How much would i need to work out to be able to fly like Superman?

[Anonymous No.9931093]

>>9931031
Everything has a manufacturer. You might have to Email the seller instead.

[Anonymous No.9931100]

>>9931093
>Everything has a manufacturer.
Even the universe.

[Anonymous No.9931103]

>>9931100
How would you know?

[Anonymous No.9931105]

>>9931093
well ok the company that owns the brand says the black bags protect against light (?) but they're not properly UV-resistent and they want you to buy the more expensive clear ones that have a UV-resistent additive

but my customers won't give a shit and the black would look stupid to some people like a trash bag or dog poop bag so i'll just buy the cheaper clear bags from a different seller

[Anonymous No.9931107]

>>9931105
If you need UV-resistent bags you have to buy UV-resistant bags. Is that difficult to understand.

[Anonymous No.9931108]

>>9931103
>How would you know?
Because everything has a manufacturer.

[Anonymous No.9931109]

>>9931107
i just randomly saw the black bags while looking for cheap clear bags and the black ones were in my price range so i was considering them if there were any benefits at all to them even if it's just a perception thing (would they look fancier to the customer? or just weird?) but w/e

[Anonymous No.9931112]

>>9931109
Then ask your shops for samples / data sheets / information you actually want to know.

[Anonymous No.9931116]

>>9930612
lel it made it into the dictionary
https://en.wiktionary.org/wiki/manlet

>>9929576
just to add to this the primary source of manlet and most /fit/ memes like DYEL was probably the bodybuilding.com misc forum which coexists with /fit/

[Anonymous No.9931119]

>>9931116
>bodybuilding.com misc forum which coexists with /fit/
Co-Dependency is fun!

[Anonymous No.9931127]

>>9929469
dates back to the 19th century
https://en.wiktionary.org/wiki/brainlet

[Anonymous No.9931129]

I'm ashamed to ask this but here it goes:

Does an energy eigenbasis in QM allow you to discuss values/quantities with respect to any set of quantized particles in the system?

For example, I want a QM description of a photon-detector which takes some photon that interacts with my material in the detector, and then produces some small amount of current.

Could I describe the intensity (at some time dt) as the expectation value of a creation operator multiplied with an annihilation operator? Where physically the annihilation operator annihilates the photon state, and the creation operator corresponds to the quantized current produced in the detector?

I understand that the creation operator multiplied with the annihilation operator is the number operator, and thus you can say that the intensity corresponds to the number of photons for that time frame, but physically I'm trying to grasp how I can model quantities with these operators.

[Anonymous No.9931178]

How do you show that there is no bijective mapping from the natural numbers to the real interval (0,1)?

[Anonymous No.9931182]

>>9931178
>How do you show that there is no bijective mapping from the natural numbers to the real interval (0,1)?
https://en.wikipedia.org/wiki/Cantor%27s_diagonal_argument

[Anonymous No.9931183]

>>9931178
Look for Cantor's diagonal on Google.

[Anonymous No.9931189]

>>9931182
>>9931183
Thanks, now I feel retarded. I just read an example of using this argument to show that the naturals and the rationals have the same cardinality, but it didn't occur to me it could be used in this case too.

[Anonymous No.9931191]

>>9931182
Let G be a group and [math]a, b, c \in G[/math].
Show that the equation [math]a \cdot x \cdot b \cdot x = c \cdot x[/math] has a unique solution in G.

---
I don't know how to show existence first. I can't use x inverse because I don't know if it exists in the first place. I can multiply to the right the equation by b and get [math]a \cdot x \cdot b \cdot x \cdot b = c \cdot x \cdot b[/math] which simplify to [math]a \cdot k = c \cdot k[/math] if [math]k = x \cdot b[/math]. But I still can't get anywhere.
I'll be grateful for any tip you guys have.
Thanks.

[Anonymous No.9931192]

>>9931182
Sorry, didn't mean to quote you.

[Anonymous No.9931196]

>>9931191
Correction: the first k is squared.

[Anonymous No.9931201]

>>9931191
>I can't use x inverse because I don't know if it exists in the first place.
You're supposed to pretend like it does exist, then find out what it has to be.

axbx = cx
axbxx^{-1} = cxx^{-1}
axb = c
a^{-1}axb = a^{-1}c
xb = a^{-1}c
xbb^{-1} = a^{-1}cb^{-1}
x = a^{-1}cb^{-1}

this exists since a,b,c are in G and so a^{-1} and b^{-1} are in G

then show axbx = cx

[Anonymous No.9931202]

>>9929576
>5"10 and below
Har har, very funny, but we all know the cut off is 5'9".

[Anonymous No.9931211]

>>9931202
5"10 is king of manlets, which is still manlet and you know it

[Anonymous No.9931217]

>>9931201
Alright, thanks!

[Anonymous No.9931223]

Can someone explain wtf is going on in the second paragraph?

[Anonymous No.9931248]

>>9929447
Would it be possible to coat a 3D Printed plastic gun barrel with graphene in order to make it withstand the explosion shock?

[Anonymous No.9931266]

>>9931211
The average height for men is 5 7.8

5'10" is like two standard deviations above the average so setting manlet < 5'11" is absurd.

[Anonymous No.9931276]

>>9931223
bruh there's only one paragraph there

[Anonymous No.9931282]

>>9931266
That's still manlet. Just deal with it. It's not like being a manlet disqualifies you of anything, it just makes you a manlet, nothing else.

[Anonymous No.9931291]

>>9931266

[Anonymous No.9931294]

>>9931129

bump

[Anonymous No.9931299]

>>9931291
Another fun fact: women usually memorize these sizes but they don't have a clue what they look like (unless you're really short).
Same for penis size, they say that they only like 7 inch dicks, but you can bang them with your 5.5 willy and they won't even notice if you don't tell them. It's not like they're gonna pull a metric tape out of nowhere and measure your cock or your height to check anything, nor they can't do it by looking.
Not that it really matters anyway.

[Anonymous No.9931301]

>>9931299
nor can they*
I'm retarded, yes.

[Anonymous No.9931306]

Is a high IQ really that important?
What are the benefits?

[Anonymous No.9931310]

>>9931306
>Is a high IQ really that important?
No.
>What are the benefits?
You can pretend you're smart and useful and keep growing your ego until no one wants you around, because you're a pain in the ass.

[Anonymous No.9931336]

C16H17N30+C6H10O(cis-3-hexenal, apparently a volatile compound in tomatoes)=C22H27N3O? Is it true that C22H27N3O breaks down to C20H25N3O in stomach?

[Anonymous No.9931338]

>>9931276
you know what i mean nigger

[Anonymous No.9931343]

Is the bible true?

[Anonymous No.9931362]

ok the fancy pants branded ziplock bags are more expensive but still within my price range, the thing is they look equivalent to the cheaper ones except they claim to have an asymmetric lock that won't open from the inside, is there any merit to this claim or should i just go with the cheaper ones

[Anonymous No.9931365]

>>9931266
depends where you live, global height isn't a good indicator because theres billions of tiny asians

[Anonymous No.9931373]

>>9931248
I have heard you can use tape to extract layers of graphene. It is extremely lite and durable but it combusts at 662℉ and can also conduct electric current. I imagine you could layer graphene bit by bit on the plastic with something like an adhesive.

[Anonymous No.9931385]

>>9931248
i doubt it would be feasible without lots of R&D at least but look into this maybe:
https://www.youtube.com/watch?v=ilWst2zq-D4

[Anonymous No.9931410]

>>9931362
i found another low price seller that also claims to have an asymmetric lock but they have a red line and a round hole so they look like dirt cheap bog standard druggie household bags smdh

[Anonymous No.9931425]

that's it i've decided on the cheap plain clear bags that are as inoffensive as they come, no branding, no recycling information, no colored lines, no holes, and sufficiently durable, customers won't be autismo about the bag

[Anonymous No.9931441]

How do i turn shiny with mad german doctor?

[Anonymous No.9931499]

if an event has a n/k chance of happening when X is "run", what are the odds of the event ocurring when X is "run" k times?

I'm mostly interested in the case where n = 1.

[Anonymous No.9931502]

>>9931499
Also, what are the odds when X is run ky times where y can be any positive rational number.

[Anonymous No.9931506]

>>9931385
>>9931373
I was asking more of a theorical question, im excited about 3D printing specially guns but the problem is that plastic has horrible resistence
So maybe some coating would solve
Maybe this could help https://www.youtube.com/watch?v=DWkYRh6OXy8
Or making bullets like these https://www.youtube.com/watch?v=cJAXpyt8-oQ&t=605s
Metal printers exist but cost half million dollars, so maybe some more cost efficient method will appear soon

[Anonymous No.9931588]

When learning mathematics, do you try to get a visual understanding (be it geometric intuition or how the logic of the process or concept unfolds) or are you satisfied with simply being able to work in the abstract? It seems like schools push for the latter, and that makes it really hard for someone with compulsive tendencies like myself keep up.

[Anonymous No.9931598]

>>9931306
>Is a high IQ really that important?
It depends for what you need it. If you want to become a global player or a scientist it is of course. If you want to be happy it will make you not reach your goal.
>What are the benefits?
People will tell you how intelligent you are but laugh at every fault you make in order to feel better. You can better point out everyday's stupid shit and develop your social intelligence better in order to better understand and manipulate your folks (unless you're the beta version of an INTP). You will question basic concepts and things like love, death and wealth which can make you very depressive. There was that one 14 year old kid that was so intelligent that he literally finnished a biology semester in a week who later on cobained himself. Also you'll get very unemotional since you're mainly focused on rationality.


I wouldn't give up being a 127 iq brat but I'd be more happy if I wasn't such an overthiking faggot.
"Luck is the rarest thing found in intelligent people"

-Some intelligent d00d.

[Anonymous No.9931643]

>>9931299
So should I lie on tinder and say I'm 6'2 when I'm actually 5'10?

[Anonymous No.9931645]

>>9931643
Definitely

[Anonymous No.9931666]

>>9931643
For sure bro. It's no different than women wearing makeup or using filters in their pictures.

[Anonymous No.9931681]

>>9931425
What the fuck are you selling in these bags?

[Anonymous No.9931886]

>>9931127
>https://en.wiktionary.org/wiki/brainlet
It does!

[Anonymous No.9931892]

>>9931588
How do you fare with tracking measurement uncertainties during your calculations?

[Anonymous No.9931904]

Can someone help explain this formula to me? What does the sigma mean in this context?

[Anonymous No.9931913]

>>9931904
Sigma is a shorthand symbol for a sum over all t from 1 to n.
Your formula just means that the NPV is the sum of the present value of all cash flows

[Anonymous No.9931921]

>>9931913
So basically, I need to calculate the initial cost (CF0) then add the cash flows (CF1/1+r)t then repeat for however many cash flows there are?

[Anonymous No.9931938]

>>9931921
Sort of. CFt/(1+r)^t is not the cash flow, it's the present value of a cash flow t years in the future. The division by (1+r)^t is bringing the future payment back to it's value at time 0 (present).

But your idea is right, you just calculate however many present values there are and add them all up.

[Anonymous No.9931952]

>>9931938
Don't suppose you could explain this?

[Anonymous No.9931968]

>>9929576
>explaining shit to newfags
Thanks for helping to ruin this board.

[Anonymous No.9932006]

Will battery acid dissolve nickle, copper and brass but leave gold solid?

[Anonymous No.9932122]

what would happen if you dipped your ball sack in vodka for 10 minutes?

[Anonymous No.9932126]

>>9932122
it would be sterilized of microbes and your sac would shrivel
if you dipped your sack repeatedly rather than submerged it, you would find it would cool very rapidly as alcohol has a low evaporation temperature

[Anonymous No.9932160]

Whats the difference between bound and free currents? I cant understand what defines these, and why H is so important

[Anonymous No.9932212]

Can anyone explain the kinetic theory of gases on a quantum level? Or point me in the right direction?
This webpage perked my interest :

http://www.informationphilosopher.com/articles/ideal_classical_quantum_gas/

...but it really doesn't go into detail.

[Anonymous No.9932306]

A single rotor helicopter would have a much more efficient than a quad rotor correct? And calculating off a 40 ft blade length a dual rotor will always be better than a quad for lifting heavy too right unless you build the thing from titanium?

[Anonymous No.9932308]

>>9932306
I meant a single rotor will always be more efficient than a quad rotor correct*

[Anonymous No.9932322]

>>9930258
desu the order does not matter. I learned bio before chem and then relearned bio in college, but I did not feel like the chemistry I learned helped me much if at all in bio.
Just go in any order you really want to.

[Anonymous No.9932352]

I have to pick one of them by the end of this month

which one you recommend ? and why ?

[Anonymous No.9932360]

why is the radian system better than the degree system of angle measurement?

[Anonymous No.9932372]

bump

[Anonymous No.9932405]

>>9932212
I don't know much on the subject, but the idea is a little straightforward. You have this thing in Statistics called the Gaussian curve. You can't really measure the speed of all the particles, however you can calculate some average. The Gaussian curve requires to variables, the mean and standard deviation and it means that there are as many values below the average as there are above the average. This is key here because in reality, gases cannot actually reach certain speeds due to quantum mechanics. In addition, most gases have very fast particles rather than slow particles, so you get something similar to a Chi Square distribution. Here's a graph of molecular speeds of various gases. Here is a Chi Square graph. Note that Chi-Square is actually many different graphs that all have similar characteristics. There isn't much at play here other than the fact that different molecules have different degrees of freedom. Degrees of Freedom means how many ways can a molecule move, there is translational, rotational, potential, etc. Chi Square also has degrees of freedom which is what the n stands for in the graph. Gases are conceptualized like this because the molecules in the gas all have many different speeds so its best to use a statistical to approach. Many early scientists struggled to find a way to characterize gases that is until they combined statistical methods. Then quantum theory came in and explained that statistics was the best way to represent what you see in experiments. All quantum theory really said was that particles receive discrete levels of energy hence the degrees of freedom.

[Anonymous No.9932439]

>>9932306
Efficiency is measured by the consumption of energy. You can build a quad with motors that each use 1/4 of heli's energy with the same efficiency and you get the same thing. Only real difference is that quads are overkill the weight is expected to offset the air hitting the heli/quad. A quad is uses 4 rotors so it can better stabilize hence why drones use 4 rotors. In the old days they made toy helis a lot but they sucked imo. Often these toy helis got flipped over with these ease, then came quads which stabilize with a gyro and can pretty much maneuver like a car(albeit a little different). Reason why don't see people flying in quads is that they are overkill. A heli uses the weight to stabilize. Note the blades are also longer so a heli rotor needs to produce much more torque hence why they are so slow. A quad with the same efficiency will ideally have smaller blades that let it accelerate very quickly whereas heli needs a heck of a lot torque. So in the end a heli might even cost you more if you tend to try to change directions or accelerate very frequently. By very frequently, look at a quad. Who uses quads, the military does and for a darn good reason.

[Anonymous No.9932511]

>>9932439
Thanks for the in depth response.

I made small quad rotor camera drone using a raspberry pi zero kit. I was wondering how small you could make these things and I assumed a single rotor would be more efficient but;
>You can build a quad with motors that each use 1/4 of heli's energy with the same efficiency and you get the same thing
Seems like it wouldn't be worth it and accurate steering on a single rotor seems like a lot of trial and error.

[Anonymous No.9932519]

>Higgs field gives way to mass but breaks down at high temperatures
>Collapsing star into a black hole heats itself to infinity as force of gravity goes to infinity
>Somehow people think that a superdense singularity can form

Why are physicists so stupid and willing to accept shit that breaks every rule ever?

Retards need not respond.

[Anonymous No.9932562]

>>9932405
Thank you.

[Anonymous No.9932725]

>>9932511
Yeah I purchased a drone the size of a quarter. The blades are really small. A heli the same size would not work, because the air would capsize it right away.
How was the R pi zero? I am thinking about making one but fully autonomous and might even use FM radio signals to navigate. I can see why this wouldn't work simply because FM radio has a wavelength of about 300 meters. So that means the drone would need about 150 different radio stations so that you could update the position every meter. This is because at very fast speeds, 2g and 3g although very accurate, aren't as reliable when traveling, but radio waves are because you constantly get signal. But if you combine both you get a powerful setup that can use radiowaves to update the 3g signal, thus reducing the steps needed in a Kalman filter. This is possible only with certain radiostation however.

[Anonymous No.9932787]

>>9931681
nothing too crazy just hobby/crafts materials. my business model mainly relies on keeping costs down because every dollar saved without sacrificing the quality in the eyes of the customer is pure profit for me so if i'm gonna spend $30-50 on 1000 bags i want to make sure i get the right ones. i probably would have bought 100 bags for $4 if the local stores didn't suck tho.

[Anonymous No.9932878]

>>9932519
>magnetic monopole

[Anonymous No.9932891]

>>9932306
> A single rotor helicopter would have a much more efficient than a quad rotor correct?
Large rotors are more efficient than smaller rotors.

The main factor affecting efficiency is turbulence. A fixed wing is normally moving through clean (non-turbulent) air. With a propeller or rotor, the blade is moving through the turbulence ("wash") of the preceding blade. A greater radius increases the distance from the preceding blade, which means cleaner air. Similarly, fewer blades increase the distance (multiple blades increase the total thrust for a given radius but reduce the efficiency).

[Anonymous No.9932906]

>roll up headphones
>tie them up in two places
>put them in a small tight bag
>leave bag in office drawer
>come back the next day
>get headphones
>wires are in a tangled mess

WHAT THE FUCK?

[Anonymous No.9932924]

Should I do cyber security, computer science or computer systems engineering?

[Anonymous No.9932940]

>>9932924
compsci

[Anonymous No.9933047]

>>9929447
Shouldn't the image say "your" instead of "you're"?

[Anonymous No.9933099]

>>9932519
This is built on the misnomer that the Higgs field grants mass - it doesn't - and on the misnomer that three solar masses somehow equals infinity - they don't. The other, much more common misnomer behind all of this is that which assumes you alone understand a complex field better than those millions who dedicate their lives to it.

If something established in physics seems stupid, it's because you don't understand it. There's millions of experts trying to disprove these sorts of things and provide viable alternative hypotheses across the world every hour of every day, so if they don't go away, there's a reason for it. Only once you're educationally qualified to be considered a expert in that field, and understand the reasoning behind the fundamentals, can you critique aspects of that ongoing conversation.

[Anonymous No.9933102]

>>9933047

[Anonymous No.9933120]

If the force between two quarks increases as they get farther away from each other and they always come in pairs what would happen if we isolated a quark in a universe with the same laws of physics as ours?

[Anonymous No.9933141]

>>9932360
https://math.stackexchange.com/a/2277836

[Anonymous No.9933155]

>>9929908
Pymol

[Anonymous No.9933344]

BEST way to cram? how do i divide 2 weeks to study for 5 exams? I have mondafinils help required asap

[Anonymous No.9933488]

>>9930258
>physics, chemistry, and biology
All three exist more or less in a vaccuum, with minimal crossover. Start with whatever's most fun and most complicated

[Anonymous No.9933511]

>>9933344
3x3hour blocks per day. Then alternate between subjects. Do this the whole Semester.

[Anonymous No.9933519]

>>9931643
why the fuck would you tell anyone your height in the first place?

[Anonymous No.9933563]

I want to predict RNG of a game, apparently it uses a linear congruential generator to generate stuff, is it possible to predict if I know nothing about math?

[Anonymous No.9933689]

>>9929447
Best country to practice medicine while not being severely underpaid? I'm an argie fag, for reference.

[Anonymous No.9933701]

>>9933519
>anon you're so tall how tall r u
>6'2
>that's hot i bet something else is tall :3

[Anonymous No.9933828]

People always talk about how all the plastic & styrofoam shit we make is gonna sit around for thousands of years because nothing will decompose it, but isn't it more likely that microorganisms will eventually evolve to fill the niche if we leave it long enough?

[Anonymous No.9933845]

>>9933828
Plastic maybe, as there's carbons involved and there's already a few things that eat it, they just aren't very prolific. Styrofoam, not so much so. There's plenty of toxic and inert substances on the planet nothing has evolved to eat, as there's no efficient way to extract nutrients from them.

Not that "waiting for something to evolve to eat it" is a sound plan anyways, given the time involved. Engineering something to eat it might be an option, there's enzymes that'll break plastics down, but, well, among other issues... Imagine the sort of destruction a prolific airborne petrol-product eating microbe could do to civilization.

[Anonymous No.9933851]

>>9929447
why is kinetic energy the integral of momentum (or obverse with derivatives yada yada)?

is there a particular reason or is it just for the sake of being able to solve/simplifying the way to solve certain dynamics problems?

.t uni student who had absolutely shitty physics professor and a great dynamics professor who said refer to physics course for basic understanding (he would have gladly explained but I just never got the time to ask).

[Anonymous No.9933860]

>>9929447
Using this book for a first course in undergrad thermodynamics. Is it any good?

[Anonymous No.9933870]

>>9933860
Really? If that's the statistical mechanics book then we used it in 3rd year, and it was not trivial (/easy) stuff.

[Anonymous No.9933873]

I just graduated with a Masters in mathematics and I want to kill myself.
Is this normal?

[Anonymous No.9933885]

>>9933828
Eventually the Sun will take care of it when it becomes a Red Giant in 4 Billion years.

[Anonymous No.9933890]

>>9933873
Yes. Please consult your College Psychological Service.

[Anonymous No.9933897]

>>9933870
Ooops shoulda wrote stat therm.

[Anonymous No.9933949]

>>9933885
It'll evaporate the oceans entirely in less than 1 billion, at which point there won't be anything here left for the plastic to kill anyways.

Meanwhile, however, we've got fish to eat, so better figure a way to clean that shit up.

[Anonymous No.9933962]

>>9933949
This was meant as a: If nothing evolves until then, it still won't matter.

[Anonymous No.9934015]

>>9933890
>Please consult your College Psychological Service
So nothing.
Wonderful.

[Anonymous No.9934039]

Can someone with a Master's degree in a STEM field publish?

[Anonymous No.9934236]

>>9933563
No.

Even if you understand the math and know all of the LCG's parameters, you'd typically need a very large number of samples in order to determine the state.

[Anonymous No.9934481]

If the universe is the totality of Space and Time would Time travel really violate conservation of energy?

Wouldn't the matter/energy still fundamentally be contained within the universe?

[Anonymous No.9934635]

If I go really fast and break the sound barrier and cause a sonic boom can I slow back down again then speed back up and break the sound barrier again over and over and just spam sonic booms?

[Anonymous No.9934636]

>>9934635
yes

[Anonymous No.9934638]

>>9934636
Why don't people do that then? They just go whoosh and cause one then it's over. If I were a jet pilot I'd be spamming sonic booms all over the place tbqh.

[Anonymous No.9934649]

>>9929605
I'm sorry I am a little too drunk for a complete answer but this might help.
https://www.pasternack.com/t-calculator-fspl.aspx

Signals can either be radial (not aimed) and fall by the inverse square of the distance...
Or they can be directional and focused from antenna to receiver and be much stronger. Either case the math is out there but slightly complex, but tldr signal loss is pretty significance across large distances.

[Anonymous No.9934660]

How do I get good at combinatorics? I'm trying to do my basic enumeration problem set and it makes no sense to me that given a problem, there's a "correct" way of counting things. Counting feels impenetrable.

[Anonymous No.9934668]

Why can't FTL speed be achieved. And don't give me that shit about light being weightless.

[Anonymous No.9934672]

>>9934649
>>9929605
The rule of thumb I've read is that the most powerful omnidirectional signals man has ever created are not detectable beyond the orbit of Jupiter. (So, yeah, "Contact" is bunk.)

Focused ones can reach tens of thousands of light years away, but even there, in addition to the fact that the most powerful ones we've sent won't reach their destinations for thousands of years, if our SETI program received those same signals here, we'd discard them as false positives. Too weak and too short.

Suffice to say, all extra-orbital probe communication is directed, and wouldn't work without knowing almost exactly where the probe is.

So no one in space is hearing your wifi or CB, regardless of the juice you put into it. Ya need one of those big dish thingies.

[Anonymous No.9934704]

>>9934668
But it is... But it also doesn't travel faster than light, cuz well, it's light. All massless particles travel at the speed of light, and indeed, can't travel at any other speed (in a vacuum).

Matter with mass gains mass at relativistic speeds, so the closer to the speed of light you get, the more energy you need to continue accelerating, and this compounds to the degree where you need infinite energy to reach the speed of light. Additionally, there's the time dilation problem. If you are moving at the speed of light, from your perspective, time isn't passing (and not just because you're probably dead). Thus the phrase "photons do not experience time". Lastly, if this speed limit were not in place, the universe couldn't exist (or, at least, we couldn't exist to observe it).

There's a lot more to it than that, and the reason why the speed of light is the limit (and doesn't actually have anything to do with the speed limit of light, but of causality)... and then we can talk about the various theoretical ways around that (most of which involve negative mass, or some similar such magic), and the possible violations of causality that might entail, but that'd be another thread or three.

Here's some pop-sci that might help:
https://www.youtube.com/watch?v=msVuCEs8Ydo
(This one may involve a pony - don't ban me.)

[Anonymous No.9934739]

>>9931052
That's batman dum dum.

[Anonymous No.9934765]

>>9934638
It does strain the plane, and also if you were spamming sonic booms on a single target you would be making predictable movements and approaching them at subsonic speeds.

[Anonymous No.9934769]

>>9934704
Hey can you answer >>9934481

Please.

[Anonymous No.9934773]

>>9934039
Publish what and where?

[Anonymous No.9934798]

>>9934769
>>9934481
I'll try... The short answer is that isn't the problem. If you have a torus shaped spacetime, for instance, you can have your chronological violation with no violation of conservation of energy, but then you, eh, have this problem of a mass smashing into itself. Violation of causality is your real problem.

It's also useful to remember the laws of thermodynamics are not absolute and do not dictate what the universe can and can not do. They each break down under certain extreme circumstances (in the case of symmetry breaks caused by the higgs field, do so constantly), and only limit how physics should behave universally under nominal circumstances (eg. space not curving back on itself). Change the nature of the universe, and you change the nature of thermodynamics. Throw a causal violation into the mix, and a good chunk of thermodynamic laws no longer apply.

Look up block universe though - ya might be interested in that, as it is one of those odd and fundamental fact of the universe that touches on what you're speaking of, though it might not hold if some of the more promising of these quantum gravity theorems ever manages to be viable.

[Anonymous No.9934818]

How does the electric current of a 10000V 1A circuit compare to that of a 1000V 1A circuit at the atomic level in a cross section of the conductor? If the speed of the current is constant, and the amount of current through a given point in the circuit is the same per unit of time in both circuits, is there simply less work required for the electrons to move in the higher voltage circuit? Is that what explains the higher total power in watts for the 10000V circuit as opposed to the 1000V? I know it's possible to achieve a very high voltage with comparatively low current using a step up transformer, as is done in those massive power lines(which is done because V = IR, correct?). Sorry if all of this is totally wrong. Thanks in advance.

[Anonymous No.9934829]

>>9934704
>>9934668
Might help to keep in mind that matter's mass is essentially the result of bound massless particles oscillating at the speed of light. Matter is just "canned energy", a box with internal dynamics. This is, basically, what makes matter "work" - that, internally, protons and neutrons are made up of quarks that are dancing around inside them at the speed of light. This self-confinement is what grants resistance to acceleration (most of their mass), as well as an internal clock, and allows these structures to exist and interact (to be bound to begin with). If they were pushed to travel at the speed of light, those bits inside could no longer interact. All the energy is on one side of the "can", which thus no longer bounds them. The structure effectively ceases to be, and is now a bunch of freed massless particles, which have no choice but to travel at the speed of light every which way, releasing their rest mass as gamma radiation, never to slow again. (Electrons are a special case, as they are fundamental particles, rather than composite ones, but they ain't hanging around with no atomic nucleus to keep them there.)

Doesn't quite describe what might happen, but gives a hint of the sort of problem light speed travel would entail (let alone faster than light, as that's a whole other can of worms).

[Anonymous No.9934846]

>>9934818
To keep it at similar terms to what you are thinking at
10000V=1A*10000ohm
1000V=1A*1000ohm
Therefore the electrons in the 1000V circuit is having less collision have less work.

You want to fix the resistance instead of the current in your example. For a fixed resistance(loss) a higher voltage can deliver a higher current.and power (P=VI)
1000V/1Ohm=1000A
100000V/1Ohm=10000A

[Anonymous No.9934870]

>>9933851
Hmmm, well the differential addition of velocity adds to the kinetic energy. The integral describes the cumulative additions (total kinetic energy.)

[Anonymous No.9934880]

>>9934846
Okay, thanks. How do those transformers work for "stepping up" voltage and "stepping down" current in the electrical grid. How does it happen without resistance power losses?Again, thanks.

[Anonymous No.9934897]

>>9934481
Speed of light is finite because that is how fast information needs to travel. Use 2 supermassive black holes as example and consider these two distinct possibilites:
1) you can move faster than information does. This means you can move to a location before that location is even aware that you are there. If two supermassive blackholes merge, this would mean that the speed at which gravity waves travel is different for each blackhole. As a result, you might notice some bizarre spiking in certain areas and then very small but quick spikes of gravity another due to waves interfering asymmetrically. You accelerate irrationally, you suddenly stop, then jerk(a measure of how your acceleration changes with respect to time). Light would be completely eradicate, but because information varies depending on sourcem but light would also enter a blackhole almost immediately. Black holes are no longer surrounded by light and entire galaxies move very slowly(because particles can now move to locations before their information comes forward, the information update takes longer to destabilize. This means energy interacts using particles and not the other way around. This is done this way because you want to be there before the information of you being there. It's as if Saturn was up in the nightsky near the moon but there were no effects whatsoever because its information had no yet arrived. In this regard information and remember that even when Saturn approaches the speed of light, the speed of light still travels the speed of light relative to Saturn, but to us, the light had a head start on Saturn so it looks almost as if that beam of light came out of nowhere, reaches us, then Saturn gets here. Now imagine Saturn surpasses that light so what we Saturn arrive here, then we see a random beam of light. What you actually see is Saturn going back in time almost like a hologram of the Saturn in front of us and then shining beam of light.

[Anonymous No.9934926]

>>9934880
Well transformers DO have losses. Everything in the grid does, it's just manageable.

Anyway transformers work by induction. The primary and secondary coils have a different number of coil windings around a shared magnetic core. Since there is a different number of coils, the amount of current induced is different (and there voltage across other coil.) You vary the windings to get higher or lower voltage.

[Anonymous No.9934932]

>>9934926
Okay, thanks mate.

[Anonymous No.9934943]

>>9934481
>>9934897
Scenario 2)
You bring you grab yourself and your spaceship. Instead of trying to travel faster than light, you want to stay in the same place, but instead try to move through time. This is totally possible given the nature of Quantum Mechanics, except for Parity. If we were looking at you, we would essentially "forget" seeing you. Why is that you ask? The particles in your spaceship traveled upstream in terms of energy. So they wanted to actually move to a place(in time that is) where each of the particles was higher in energy than it is and thus go forward in time. You have to remember, all you really have to do is swap out a the particles involved in this system, because a point in our universe is not {x,y,z} but {x,y,z, t} and t is measure relative to light So all you really have to do is get all those particles to move to the same location, with the same energy and same time. Because time is relative, you should be able to do this(if time is relative it can be manipulated via energy). However charge parity kicks in. Charge parity says that particles undergoing some transformation into their antiparticles is possible. So an electron becoming a positron is possible. This means you can move to another point in time and fix whatever particles didn't stabilize as they should have. However, charge parity is violated for weak decays. The strong force holds protons and neutrons together. The weak force tries to separate them. The problem is in weak decays, the particles released may not have charge parity, rather it is a statistical distribution of the various levels of decay that can occur. So basically it the number of antiparticles that can be produced through weak decay is uncertain so this means that you cannot necessarily know which particles were once antiparticles and vice versa. So in essence to time travel, in any direction, you have to know which particles you have now, which antiparticles you will have then.

[Anonymous No.9934993]

>>9934638
gotta go fast

[Anonymous No.9935018]

>>9929447
>G is a simple connected graph where every vertex has degree at least (k-1).

Must there exist a complete graph on k vertices on G? I couldn't find any counterexamples for small k.

I know this is not really a "stupid" question but I'm asking here because I feel stupid for not knowing whether such a theorem/hypothesis exists or how to google it.

[Anonymous No.9935403]

What prevents praying mantis families from living more than two years and growing to one meter or more?

[Anonymous No.9935505]

>>9934773
math and I have no fucking clue but i'm interested in continuing research in my off time

[Anonymous No.9935595]

What algorithm do I use to get this piece flipped?

[Anonymous No.9935599]

>>9935403
Their hunting tactics would have to be even more passive in order to sustain a larger size.

[Anonymous No.9935608]

>>9935595
I know but I don't know how to write it

[Anonymous No.9935654]

If most of an atom is empty space why are objects and people solid? im serious i dont get it

[Anonymous No.9935674]

If there is a rainbow, there is often a second, weaker and bigger one "above" the first.
Why is that?

[Anonymous No.9935678]

>>9935654
Watch a video explaining nuclear forces.

[Anonymous No.9935682]

>>9935674
Because it is just a trick of the light and your eye off of the water vapor in all of the air, it is like a series of very small prisms, so on a clear and misty enough horizon you will see more viewing angles worth of refraction.

[Anonymous No.9935755]

Will we be able to halt or even reverse aging within this century?

[Anonymous No.9935774]

Am i the only one here who thinks downies and adhd tards should be euthanized?

[Anonymous No.9935775]

>>9935654
Protons, neutrons, and electrons are not planets or ping-pong balls - they are not objects in the traditional sense - rather they are spheres of influence (waves) that resolve at points (particles). Thus the concept that an "atom is mostly empty space" is only partially true. It'd be more accurate to say that the entirety of the atom is occupied by the potential forces of its component parts.

[Anonymous No.9935784]

>>9935775
Interesting.

[Anonymous No.9935812]

>>9929447
Can I make a monkey crocodile hybrid by placing both animals in a particle collider?

[Anonymous No.9935833]

I'd like to make an animated force diagram of forces over time in a system. What are some easy ways to do this?

[Anonymous No.9935850]

>>9935595
isn't it part of the puzzle to figure out things like that on your own

[Anonymous No.9935864]

>>9935654
It's not "empty space" it's "unmanifested space". I like using the balloon analogy but it's a bit more complicated than that.

The air inside balloon is indeed not rubber, but still gives the rubber of the balloon its spherical shape. You can call the air "nothing" or "empty space", but that's only if you're looking for rubber in the first place and refuse to accept that there's anything but rubber inside what you're looking at.
The more "empty space" you add to the balloon, the bigger it gets...does that make any sense whatsoever? No, obviously what you're witnessing is "filled space" not "empty space" being poured into a container that holds a certain amount of pressure. Well when you fill the balloon too much then things start to become unstable. However, you can reduce the size and increase the pressure of the rubber balloon if you add another layer of rubber over it. You can only do this so much though and eventually it will pop.
Depending on how many layers of balloons you have wrapped around your initial balloon the explosion could potentially kill you, or only some of the layers will burst while the remaining layers absorb and reduce the initial failure of whichever layer broke first. So you either have one big boom or several small booms. This is analogous to your nuclear explosion/energy, with the balloon remnants being your radiation.

[Anonymous No.9935868]

>>9935755
Probably not.
>>9935774
No, but it is a minority to be certain. Perhaps limiting reproductive capabilities would be good in the most extremely cases.
>>9935784
Yes.
>>9935812
In the sense that both a crocodile and a monkey would have been intermingled, yes.
>>9935833
Learn to animate lines and circles.
>>9935850
I figured out how to do the first part by myself, and I floundered my way through lining up most of the side pieces, but I don't have a consistent way to recreate it, and I don't want to lose progress without knowing how to get back there. I really just need a win right now, anon.

[Anonymous No.9935874]

>>9935833
http://reference.wolfram.com/system-modeler/libraries/Modelica/Modelica.Mechanics.MultiBody.Forces.WorldForce.html

[Anonymous No.9935880]

>>9935774
I don't think they should be euthanized once they're born. However, I do think you're a piece of shit if you get pregnant, find out beyond a shadow of a doubt that your kid is messed up like that, and then proceed to keep the kid rather than just terminate the pregnancy and save yourself and everyone else involved, a lot of heartache, stress, and strain on an already overburdened healthcare system.

[Anonymous No.9935885]

Is LNC provable? Is proof by truth table legitimate?

[Anonymous No.9935887]

>>9935885
locally nonconical convexity?

[Anonymous No.9935891]

>>9935887
Sorry, I meant Law of Non-contradiction.

[Anonymous No.9935952]

>>9935868
>Learn to animate lines and circles.
>how do i x?
>by learning to doing x
gee, thanks anon

[Anonymous No.9935955]

>>9935952
Literally the most "Google it" task.
https://youtu.be/VIZfsEFDfss

[Anonymous No.9935992]

>>9935955
>flash

[Anonymous No.9936008]

>>9935992
Yes flash. Free, simple, unified, obscenely well documented, few frills, the only thing easier is Pivot.

[Anonymous No.9936705]

Has anyone gone through Gelfand's Algebra? Is it really best used as a supplementary book? I intend on pairing it with James Stewart's College Algebra.

[Anonymous No.9936721]

>>9936705
>Is it really best used as a supplementary book?
Why don't you try it and find out?

[Anonymous No.9936752]

Why do so many men (both gay and straight) have such effeminate voices nowadays?

[Anonymous No.9936763]

>>9936752
consequence of obama care next question

[Anonymous No.9936782]

>>9936752
Confirmation bias. You don't know what people sounded like in the past.

[Anonymous No.9937185]

So I have a dog who's dying of cancer. Bunch of tumors everywhere. The question I have is this - how the fuck did antibiotic shots and some sodium chloride solution make her go from a dying catatonic dog to almost looking 10 years younger. I'm not educated or anything, but antibiotics have nothing on cancer, so what gives?

She's got internal bleeding so probably some of the tumors are breaking off and stuff and there's metastasis coming out her ass, but it puzzles me how could this seemingly unrelated treatment help her so much?

[Anonymous No.9937335]

>>9936752
estrogen pollution
unhealthy diets
passive lifestyles

[Anonymous No.9937343]

>>9937335
There's more estrogen in onions flour than in milk?? Holy shit.

[Anonymous No.9937344]

>>9937335
can I get pregnant from eating a tofu a week?

[Anonymous No.9937355]

Optional exercise: New York City requires about 10^10 watts of electrical power, at 115 volts 12 (this is plausible: 10 million people averaging 1 kilowatt each). A heavy power cable might be an inch in diameter. Let’s calculate what will happen if we try to supply the power through a cable 1 foot in diameter made of pure copper. Its resistance is 0.05 μ Ω (5×10^−8 ohms) per foot. Calculate the power lost per foot from “I^2R losses”

i can't into electricity. i used I=V/R and plugged it in in P=IV but that's wrong, i have to first use I=P/V and then plug that in in V=IR. what am i measuring when i do what i did?

[Anonymous No.9937361]

>>9937344

i've always assumed that's how feminists spawn their s-o-yboy offspring.

[Anonymous No.9937363]

>>9937361
what about say only eating tofu and onions through your entire pregnancy?

[Anonymous No.9937469]

>>9931598

>INTP
what?

[Anonymous No.9937636]

>>9937355
To get the current, use P=I*V <=> I=P/V. To get the power dissipation in the cable, plug V=I*R into P=I*V to get P=I^2*R, where I is from your first calculation. So overall you have Pd=(Ps/V)^2*R, where Pd is the dissipated power, Ps is the supplied power (1e10W), V is the supply voltage (115V), R is the cable resistance (5e-8 Ω/ft).

It comes out as ~3.78e8 W/ft, so you lose all 1e10W over 26.45 ft.

[Anonymous No.9937650]

>>9937355
Which Book & Edition is that Exercise from?

[Anonymous No.9937663]

>>9931952
what's there to explain, you just plug shit in

[Anonymous No.9937666]

>CS major wants to work for Google
>wow cool dude
>Engineer wants to work for NASA
>wow cool dude
>Chemistry major wants to work for Pfizer
>UR EVIL BIG PHARMA BAD
why?

[Anonymous No.9937748]

>>9932352
Take all of them anon. We believe in you.

[Anonymous No.9937757]

>>9931100
>inb4 Sean Caroll makes new prediction about multiverses being made in China

[Anonymous No.9937790]

>>9937666
>CS major wants to work for Google
>U WANNA WORK FOR THE EVILCORP THAT SPIES ON US ALL1?
>Engineer wants to work for NASA
>WOW WHAT A WASTE, LOL DRUMPH """SPACEFORCE""" AM I RIGHT!? FIX EARF FURST!
Personal perception bias. You have issues, albeit, we all have issues, which compounds the problem.

[Anonymous No.9937799]

>>9936782
We have recordings of men's voices from the past 100 years. The trend is there, we are all slowly turning into women.

[Anonymous No.9937819]

>>9937666
>CS major wants to work for Google
>wow are you gonna turn into an expansive ornate building

[Anonymous No.9937821]

>>9937799
Finally

[Anonymous No.9937828]

>>9937799
[Citation Needed] - Every time I hear old timey voices, unless they're black, they are high pitched as fuck. Which is odd, as everyone was smoking back then.

[Anonymous No.9937838]

>>9937799
https://www.youtube.com/watch?v=3e5NY7V9bcs
Other than Twain, Yeats, and Whitman, these almost all sound unnaturally high pitched. May have to do with the recording method though. Almost no public speaker would be allowed to have voices this winey today. Keep in mind that most of these folks are smokers as well.

[Anonymous No.9937843]

>>9937828
>>9937838
it's played back too fast for some reason

[Anonymous No.9937846]

>>9937843
and the recording is low quality like redlining or whatever it's called

[Anonymous No.9937850]

>>9937843
From what I've read, a lot of these methods result in a playback that's too slow - so most of these voices are probably even higher pitched than the video suggests.

Dun think the average height has changed that much since they were recorded, but I suppose a lot of these guys were comparatively short, which often makes for higher pitched voices.

[Anonymous No.9937867]

>>9930700
First question
Think of taking a regular photo as integrating light flux onto the detector over a brief period of time. Very brief exposure times result in darker images.

Second Question
The shortest time to take i can think of is the time required for a photon to cross the aperture of the camera.

[Anonymous No.9937883]

why dont we bottle up all the air now and release it when global warming heats everything up

[Anonymous No.9937897]

>>9931499
You want the binomial theorem.

[Anonymous No.9937907]

>>9935654
Basically, because of electromagnetism. The electrons around the atoms in you are repelled by the electrons around the atoms in a wall, so you can't walk through a wall.

[Anonymous No.9937909]

>>9935654
Coulombs law shows that the charged particles in atoms can exert forces well beyond their point like position in space.

The solid ball approximation basically sets the solid ball diameter the distance at which atoms or ions exert no net force on each other (ignoring dispersion) which depends on the type of bonding the atoms are experiencing. A simple example would be ionic crystals.
A positive ion and a negative ion attract one another. however there reaches a distance at which the positive nuclei and electron orbitals are close enough to each other that they begin to repel each other more than the net attraction. In their crystal they're bound to vibrate between being attracted to one another and repeling one another billions of times a second.

So when you poke the crystal your finger atoms eventually get close to the surface of the crystal a similar distance as the one between the ions (a fraction of a nanometer) which is itself about 100,000 times the size of a proton.

[Anonymous No.9937966]

>>9937883
why don't we tape together the turtles carrying the earth so that we don't have earthquakes ever again

[Anonymous No.9937977]

>>9937883
we'll build a giant fridge. a big, beautiful fridge, the greatest.

[Anonymous No.9938234]

A question about vector space, from intro to quantum mechanics Griffiths 2nd Ed.

>If the ordinary vector in 3D is (a_x, a_y, a_z) with complex components:
>a) Does the subset of all vectors with a_z = 0
constitute a vector space? If so what is its dimensions: if not, why not?
My answer: yes, it constitutes a vector space because it can be satisfied through vector addition and scalar multiplication. The dimension of the vector space is 2.

>What about the subset of all vectors whose z component is 1?
My answer: Yes, the subset of vectors whose z component is 1 would be a vector space because they are closed under vector addition and scalar multiplication, work is then shown on paper. The dimension of this vector space would be infinitely many?

>What about the subset of vectors whose components are all equal?
My answer: Yes, if |a> = |b> = ..., then the subset of vectors whose components are all equal constitute a vector space. However, because the vectors are linearly dependent, the dimension of the subset would be 3?

Where am I correct and where did I go wrong, thanks for the help.

[Anonymous No.9938236]

>>9938234
>Yes, the subset of vectors whose z component is 1 would be a vector space because they are closed under vector addition
please think a little harder about whether 1+1 = 1 or not

[Anonymous No.9938242]

Can someone help me understand the step that get rid of the log? It's a proof that sum of 1/p is divergent.

[Anonymous No.9938246]

>>9938236
I see my error in thinking, what about my reasoning for the dimensions of the vector space, where any correct?

[Anonymous No.9938264]

Notation question: Which of the sums (1) and (2) is equal to the first sum on the left?
I got confused because I saw a proof of Lagrange's identity (complex form) and the limits were weird
My question is more like "What does the first sum look like when written with 2 sigmas?"

[Anonymous No.9938316]

>>9938264
First sum:
i ... j..n
1 ... 2..n
2 ... 3..n
3 ... 4..n
...
n-1 ... n..n

Not a single one because j=1 is included in every other sum?

[Anonymous No.9938319]

>>9938264
2

[Anonymous No.9938324]

Can anyone recommend me a text abridging the historic treatises on political and economic philosophy? I want a broad base before I start reading the individual texts, if I go that far. I haven't been satisfied by GE coursework and none of the "appropriate" boards have been helpful.

[Anonymous No.9938334]

>>9938242
yer mum's divergent

[Anonymous No.9938348]

>>9938316
I see, then maybe it's [math]\sum_{j = i+1}^{n} \sum_{i = 1}^{j - 1} a_{ij}[/math]

[Anonymous No.9938373]

>>9938348
I don't know if circular definitions are valid.

A)
for(i=1;i<=n-1;++i){
for(j=i+1;j<=n;++j){
should suffice
}
}

B)
So swapped
for(j=2;j<=n;++j){
for(i=1;i<=j-1;++i){
Might yield the same result?
}
}

n=4
A) 12 13 14 23 24 34
B) 12 13 23 14 24 34
Should be the same? Though the order is obviously different.

[Anonymous No.9938374]

What are good blogs about biochem/molecular biology/related fields?
I`m personally fond of Derek Lowe, though it`s mainly about pharma.

[Anonymous No.9938375]

>>9938348
>>9938373
A) [math]\sum_{i=1}^{n-1} \sum_{j=i+1}^{n} a_{ij}[/math]
B) [math]\sum_{j=2}^{n} \sum_{i=1}^{j-1} a_{ij}[/math]

[Anonymous No.9938444]

Is this correct? I don't know how to work out NPV when they haven't given me the amount of cashflows

[Anonymous No.9938445]

Why doesn't the electron fall into the nucleus?

[Anonymous No.9938450]

Why are certain subjects, which are mathematical in nature called "Mathematical [insert subject]"?

For example, Mathematical Statistics, Mathematical Physics, etc.

Statistics and physics are pretty much 100% math at the end of the day. Like I get that there are watered down versions of subjects for certain majors, but is that all it is?

[Anonymous No.9938468]

>>9929447
what’s the best place to learn all the myth you missed in high school because you were skipping class? Assume anon has an inherent aptitude for math i.g. isn't retarded. is it unironically khanacademy?

[Anonymous No.9938473]

>>9938468
math* jesus christ

[Anonymous No.9938475]

>>9931266
it’s a meme made to intentionally make you feel inadequate you fucking autist most women actually don’t care

[Anonymous No.9938502]

My pirated version of the textbook is missing chapter 4 and 5. All I know are the titles which are "Introduction to capital budgeting" and "Issues with capital budgeting"
Anyone know any resources for those?

[Anonymous No.9938562]

>>9929447
why does this error keep showing up?
>! Package tikz Error: A node must have a (possibly empty) label text.

Although everything works properly I'm bothered by the tons of errors I get every time I compile the pdf.

[Anonymous No.9938706]

>>9933488
I can't tell if you're being serious. Are all three really isolated from eachother?

[Anonymous No.9938723]

>>9929447
Roll

[Anonymous No.9938725]

>>9938723
>23
Me smart

[Anonymous No.9938726]

What is wisdom? How can I acquire it?

[Anonymous No.9938834]

>>9938242
Power series of log around 1

[Anonymous No.9938837]

>>9930886
6^n - n!

[Anonymous No.9938842]

>>9938468
get some good math books, there are no shortcuts, you will miss out on understanding some things on a deeper level

[Anonymous No.9938852]

>>9938837
Why?
Plugging numbers for n = 2 gives 6^2 - 2! = 34, when there are only 6 possible cases: 1,1 2,2 3,3 ... 6,6

[Anonymous No.9938881]

>>9930886
you have 6 possible first numbers which means that there are 5 possible second numbers that will not match the previous number, repeat until n rolls to find that [math] 6 \cdot 5^{n-1} [/math] is the total number of results with no consecutive numbers, so simply subtract from the total number of possible results to get [math] 6^n-6 \cdot 5^{n-1} [/math]

[Anonymous No.9938911]

>>9938881
For n = 3, a realisation like "1,2,1" would still have the same number twice, but no repeated consecutive number.

[Anonymous No.9938927]

>>9938911
oh I misunderstood, the answer would be pretty similar but instead of repeating 5 you would keep decrementing by one until at 7 rolls and beyond it would be impossible not to get two repeated numbers by the pigeonhole principle, the equation would be as follows
[eqn] 6^n-\frac{6!}{(6-n)!} [/eqn]

[Anonymous No.9938933]

>>9938927
Oh, I get it. Thanks.

[Anonymous No.9938937]

Not a /sci/ regular, so I'm going to go ahead and post my stupid question.
From what I heard, we have formulas that describe the behavior of very small things and formulas that describe very big things, but we don't have a formula that 'unifies' both of them? can someone expand on it a little bit?
Hypothetically speaking, if we had a big fuck of a computer with unlimited computing power, couldn't we describe stuff like stars using formulas for quarks and shit?

[Anonymous No.9938949]

>>9938937
By far the most dominant force on very big scales is gravity, whereas on tiny scales gravity is so weak it's barely registers compared to other forces. When people talk about unifying big things with small things they really mean unifying the big _forces_ with the small forces.
The only current working model of gravity (general relativity) has serious problems when you try to apply it on scales where quantum effects start to kick in.

So the answer to your second question is that you can't just theoretically scale up your formulas for quarks because nobody has a formula for quarks.

[Anonymous No.9938952]

>>9938937
by analogy, newtonian gravity can predict the trajectory of a cannon, but it sucks for space travel, for that you need einstein's gravity, and that works pretty well but it's still not the full solution

[Anonymous No.9939056]

If a man gives oral to his wife after he gave it to another man, will she get pregnant?

[Anonymous No.9939474]

I'm reading Feynman's chapter on Special Relativity and he says something like:

Suppose you're riding in a car going at speed u and the light from the rear goes past the car at speed c. If the Galilean transformation are right, then the speed of the light measured from the car is c - u.

Shouldn't it be c + u since the velocities are opposite to each other?

[Anonymous No.9939488]

>>9939474
They're not opposite.
From rear -> past the car. They're moving in the same direction.

[Anonymous No.9939491]

>>9939488
Oh, so "past the car" means it's going ahead of the car, not behind the car. I thought it meant behind the car, since he said that the light was coming from the rear. Now it makes sense.

[Anonymous No.9939629]

>>9938468
As a person with a functioning brain buying a math book and working through the exercises should suffice. There should even be books targeted at older people who want to brush up their math.

[Anonymous No.9939747]

>>9938468
Someone recommended this book in answer to a similar question:
https://www.docdroid.net/K1VENuF/basic-mathematics-serge-lang.pdf
Seems legit, though obviously only part of the more elaborate solution.

[Anonymous No.9939833]

>>9929447
what are the odds we live in fake vaccum universe or pocket?
arent high energy experiments at CERN kinda risky?
can we ever determine it?

[Anonymous No.9939838]

Anyway to get better at Vectors in 3 space? My second Calc 3 lecture today and I’m really confused

[Anonymous No.9939852]

>>9939838
Is it just a matter of spatial understanding? That was intuitive to me but I can only see it being improved through practice. Some software/webapp that allows panning a camera around a 3d plot may help in seeing the depth.

[Anonymous No.9939898]

>>9939833
>what are the odds we live in fake vaccum universe or pocket?
We don't know, but most folks seem to be leaning towards slim.

>arent high energy experiments at CERN kinda risky?
No, as magnatudes higher collisions like it happen all the time as cosmic rays collide with the atmosphere, and that's been going on for, well, as long as there's been an atmosphere. Not that these sorts of interactions are even of the sort liable to cause a vacuum decay cascade. That'd be more of a super-massive collision between two quasars or some similar such event that "inverts" spacetime on a large scale.

>can we ever determine it?
If we get a particle collider about the size of the moon, yes, we will be able to measure the top quark and know for sure.

Which is Fermi Paradox solution #235b - every alien civilization that becomes advanced enough to do that, realizes they are in an unstable universe, and bails on it.

(Not that it's something to worry about, as it's one of those things that, if it happens, it's already happened, and as the cascade is traveling at the speed of light, it'll be over before you know it happened.)

[Anonymous No.9939917]

Could some one help me out with some dumb ass math shit. I was creating a super hero with the combined strength of all men on the planet. But I don’t know how to do math. Could one of you help me out?

[Anonymous No.9939953]

>>9939917
it's not very realistic either way so you can just wing it in most situations. when you need to mention numbers then take the average strength or the average punching power or whatever and multiply it by the numer of men on the planet.

[Anonymous No.9939960]

how the FUCK do i improve my focus? I feel like its the number one thing holding me back in my studies.

[Anonymous No.9939990]

Another Relativity question:

In the Michelson-Morley experiment, the time that the light beam takes to go to-and-fro one arm of the interferometer is equal to the time for the other arm if the apparatus is at rest with respect to the ether. Now, if it's moving, the times are different and, from that, we're supposed to calculate the speed of the Earth relative to the ether.

However, I don't get why the times measured in the lab should be different when the Earth is moving relative to the ether. Isn't the lab in the same reference frame as the apparatus? Shouldn't the measured times be different only for a guy measuring them sitting on the ether's frame?

[Anonymous No.9939994]

>>9939953
This method only works if the superhero is female. If the superhero is male it becomes a self-referencing recursion and breaks the universe.

[Anonymous No.9940001]

>>9939990
From the perspective of the lab and apparatus, both are stationary and it is the ether that is in motion. If it is motion, unless its motion is perpendicular to both arms of the apparatus, then it will cause the speed of light to be different for the two arms. This doesn't let you calculate the velocity of the ether, only that it is moving.

[Anonymous No.9940018]

>>9939994
Well he’s more of a conduit of all that power so I don’t see how it would “break the universe by also being a man

[Anonymous No.9940029]

>>9939898
>(Not that it's something to worry about, as it's one of those things that, if it happens, it's already happened, and as the cascade is traveling at the speed of light, it'll be over before you know it happened.)
There's a caveat to that - if it's happened anywhere outside our galactic cluster of blue-shifted galaxies, it'll never catch up to us. Only risk is that some event may trigger it inside our cluster. Even if it happened at our own galaxy's center though (only place nearby with a huge black hole), ya'd have around 50,000 years left to live - assuming it didn't happen 50,000 years ago.

[Anonymous No.9940083]

>>9940029
>assuming it didn't happen 50,000 years ago.
thats the thing really
it could have happend milions of years ago somewhere in our local cluster so it reaches us tommorow
it's kinda funny that we can at any moment die to some unpredictable cosmological event

[Anonymous No.9940094]

>>9929447
Who's the kid in the OP picture

[Anonymous No.9940097]

>>9940083
It's one of many thousands that could. Go look up GRB's, those are fun. Hell, half the shit that could instantly wipe us out we wouldn't see coming.

It's actually a little less worrisome than some of those others, as many of those do happen all the time, but if a vacuum catastrophe happened far enough in the past, we probably wouldn't be here. The universe is relatively calm now, compared to all the tumultuous shit that was happening further back, so it seems more likely it would have happened in this galactic primordial or before, rather than wait until now. (Though there's some cascade theories that suggest things would actually have to be calmer, rather than more excited.)

[Anonymous No.9940104]

>>9940094
>Who's the kid in the OP picture
Jacob Barnett

[Anonymous No.9940106]

why do so many leftists believe in climate change?

[Anonymous No.9940114]

>>9940097
but if we were hit by gamma flash it wouldnt instantly erase us would it?
at least not the half of the globe that was in the shadow?
>>9940106
what if I told you I'm not leftist and I still believe in it?

[Anonymous No.9940116]

>>9940114
>what if I told you I'm not leftist and I still believe in it?
I would tell you that's not relevant to my question

[Anonymous No.9940122]

>>9939960
Probably meditation.

[Anonymous No.9940159]

>>9940122
i'm not disciplined enough to meditate

[Anonymous No.9940170]

>>9939960
Marty Lobdell Study Smart

[Anonymous No.9940176]

>>9939898
>Which is Fermi Paradox solution #235b
But you don't need to go any further than solution #1, that the absence of evidence is not evidence of absence.

[Anonymous No.9940181]

im doing my practice exam for calc 1. pls help I feel like such a brainlet for not knowing how to do this

[Anonymous No.9940182]

>>9940181
What have you tried?

[Anonymous No.9940191]

>>9940182
I know f'(x) is 100 from l'hopitals rule.

I cant break up the fraction because the limit of the denominator is 0

[Anonymous No.9940193]

>>9940159
no coffee, no drugs, less sugar, no tv, no 4chan,...
but reading books, do sports, drink water, do yoga,...
short: do unpleasant healthy stuff, stop enjoyable unhealthy stuff.

[Anonymous No.9940195]

>>9940193
I love math but my brain is addicted to stimulation like 4chan, vidya, twitter.

[Anonymous No.9940216]

>>9940191
requirements for l´hospital might not be fulfilled.
But think about a situation where you can reduce the fraction (hint: numerator will be a quadratic polynomial with two different zeros).

[Anonymous No.9940242]

>>9940216
I cant figure it out. could you just spoonfeed me please?

[Anonymous No.9940249]

>>9940242
>>9940216
nvm I actually got it. its 5 thanks for the hint. im so screwed on this exam lol

[Anonymous No.9940284]

>>9939960
Adderall

[Anonymous No.9940292]

Ok heres one I'm struggling with in calc 1. any pointers would be appreciated

[Anonymous No.9940299]

>>9933701
>that's hot i bet something else is tall :3
>uh yeah, my duck is really tall

[Anonymous No.9940300]

>>9940292
What have you tried?

[Anonymous No.9940336]

>>9940300

[Anonymous No.9940347]

>>9940336
try applying the fundamental theorem of calculus

[Anonymous No.9940351]

>>9940106
>>9940116
Actually, it should be, because up until the 90's, every member of the Republican party believed in it, including your Saint Reagan.

It only became a left wing issue after Gore made that stupid movie, and Gingrich made the rallying cry against it.

[Anonymous No.9940358]

>>9940351
>including your Saint Reagan.
Huh?

[Anonymous No.9940362]

>>9940176
You do under those stupid models where one assumes a space faring civilization never starts defining its own drives, and sticks to those of the primitive life it derived from. As then every system in the galaxy should be fully colonized and populated by now, including this one, if they evolved at roughly the same rate more than a few hundred million years or so before us.

It's a stupid assumption, but folks will argue for it.

[Anonymous No.9940374]

>>9931306
no, only the skills needed in any career or pathway you want to pursue are

[Anonymous No.9940376]

>>9940358
Guardian of the gates of white heaven.

But yeah, no reason to deny it, even if you don't believe it, unless you're a right wing nutjob, and only doing it to piss off lefties, or heavily invested in dirty energy. CC denial is just an effort to reverse the trend of cleaner technology that's been ongoing since the dawn of industrial revolution, until today. Same trend that stopped London's cities from collapsing under the weight of the ash that was piling up every week, and why every city in the western world isn't choking on its own shit the way those in China are. (Though I so we should add those who are seeking jobs as chimney sweeps to that list. I suppose denying it's good for them too.)

[Anonymous No.9940392]

>>9937838
It's to do with the recording equipment itself. Imagine speaking into a microphone that had little to no bass frequency response, the result would be you only hearing the high whines and whistles of your voice while the deeper bassy parts of your voice wouldn't be picked up.
Older microphones are not as advanced as our modern day microphones, and aren't going to be picking up frequencies that we would hear in real life.

[Anonymous No.9940398]

What's the most efficient way to get good at Calc 1 after finishing a class with a terribad CC professor? Is it as simple as just doing a ton of problems, or should I be watching lectures & taking notes, or something else entirely? Any specific resource recommendations (already looked at the main guide)?

[Anonymous No.9940420]

>>9940347
ok I got it thank you. I wasnt thinking to treat the integral like a composition of functions. thank you kind stranger

[Anonymous No.9940887]

>>9940398
https://www.youtube.com/watch?v=rjLJIVoQxz4

[Anonymous No.9940888]

>>9940887
this might be good too but i haven't watched it
https://www.youtube.com/watch?v=WUvTyaaNkzM

[Anonymous No.9941034]

>>9932352
plasma, my dude!

[Anonymous No.9941190]

>>9932352
the middle one coz you might find mathematica useful for other things as well

[Anonymous No.9941377]

I have some issues with understanding flow, pic related is supposed to be a pipe of constant diameter filled with uncompressible fluid and in the middle there's a turbine which extracts some power, before the turbine there's a certain constant volume/mass flow and afterwards there's also a flow. Now, the operation of the turbine must obviously slow down the fluid after the turbine, but the total volume flow through the pipe must be the same before and after the turbine or density and thus pressure would have to increase after the turbine, what is going on?

[Anonymous No.9941630]

are tennis balls yellow or green?

[Anonymous No.9942031]

>>9929447
Grug want know why Grug peepee burn