/sci/ - Science & Math

If a black hole has infinite density why does it not consume the entire universe? Infinite density=infinite gravitational pull

>>6862433
volume stays roughly the same while mass continually grows, so the distance between it and other bodies remains the same. The product of G and this mass is enormous, but numerically small compared to the square of the distance between it and the next body.

do you have to maintain escape velocity for any given amount of time, or are you free of Earth's gravitation the moment you reach escape velocity

wtf is the rule of 20

>>6862844
rule of twenty - remove uncertain digits from your tolerance of error by rounding until the number (without decimals) is smaller than 20, inclusive. Then, round your theoretical results to the same decimal place.

ex: 1500.98410 +/- 1.203960309 J
becomes 1501.0 +/- 1.2 J

>>6862882
never hear of it. i've had 4 labs where we had to do error analysis and if my data came out like that i'd probably either report it as 1500.98 +/- 1.2 or 1501 +/- 1.2.

I'm looking to get into computer animation, but I have one to two years until I apply (changing my career) - I need to impress them come admissions and I plan to continue developing a portfolio as proof that visually, creatively I have the skills etc. In this area I'm golden.

Mathematics will also be required of course, but I don't want to be A-level or college-tier, I want to be ahead of the curve and maybe, if possible, cover the course in its entirety.What math areas should I start studying that would be related to 3D? Or would it be wise to refresh from precalc, do calc etc.

I understand that this is a bit fuzzy in whether it is a /sci/ or /adv/ question, but it's basically what areas are relevant for 3D mathematics? Please /sci/, I really want to get started ASAP ;_;

>>6862912
brush up on calc 1, and the early stuff in calc 2 (mostly geometric and multivariable stuff), then hit the books on vector calc and linear algebra. Do you need it all? No. Will you be damn well prepared? Yes.

>>6862917

Thanks man, it's relieving to hear that since I went ahead and ordered some precalc and calc books. I figure once I've got more experience in this field I'll know where to go on from there if necessary.

>>6862912
Calc 3 is generally introduction to 3D math. However, Calc 1 & 2 are necessary for Calc 3. Linear Algebra will probably be most helpful for what you need (I took a strictly computational linear algebra course, and we discussed a lot of the utilization of it computer science. One of the things was rotations, which is helpful for animation, I'm guessing. This was the intro engineering class at my former university, so I'm not sure how other schools stack up.)

I didn't take any maths before Calc 1, and I did fine. So don't worry about that stuff too much.

>>6862920
>>6862919

I really appreciate that, personally, I want to be prepared completely but it is also that, should I be accepted on the course, I can spend more time on the revision or application to the problems than actually learning it from scratch, giving me more time to do whatever will need to be done, such as coursework. Plus, having more math skills is something I've wanted but never got the chance really with my past career.

The feedback for linear algebra is fantastic, as your experience.

Thanks anons.

>>6862927
You're welcome. Linear algebra and 3D math is some cool shit. Good luck you.

>>6862419
When will I use algebra one in real life?

>>6862945
chemistry uses nothing but College Algebra. As far as high school algebra, variable are very important in the concept of abstraction, which is the idea of taking something to the next level (i.e., we can solve these equations on paper. Lets put them into a computer and we can solve an entire complicated linear system.)

Is this too much for one semester:
Organic Chem I
General Physics I
Calculus II
Genetics
Rhetoric

Trying to decide right now between an ambitious pre-med undergrad plan and a less ambitious one. If I went with the ambitious one, this would probably be my toughest semester. How hard would it be to get a 4.0 in these courses at once, from anyone who has a little experience with them?

Using the Minkowski metric. How is a curved path shorter than a straight path?

>>6863016

If it's your first rodeo with General Physics 1 and Calculus 2, then it'll be a bit difficult to keep a 4. If you self-study Physics 1 and Calculus 2 right now, you should free up more time for the other classes in the future.

>>6862843

If you have an initial escape velocity, you won't need extra forces to escape the pull of the gravitational body.

i'm a retard who just saw interstellar. explain in retard terms why people would age faster on earth than in space.

>>6862419
why is it bad to think comets are not just made of ice?

>>6862419
What's physics at uni like? One person I used to talk to said it was horrific and unlike any of the stuff he did at Sixth form.

>>6863073
Einstein's theory of relativity has some weird consequences for reality. One of these is that time can pass at different speeds in different places depending on the circumstances. One of these is that the passage of time goes slower in the intense gravity of a black hole. Actually it's any massive object that does this but giant black holes are the only things that have that drastic an effect. (However, the the effect that the Earth has is significant enough to throw off the extremely precise clocks in GPS satellites and must be compensated for.) It's not depicted completely accurately in Interstellar since to get that dilation factor you'd need to be right up against the black hole, much closer than the minimum distance for a stable planetary orbit.

How do you cite you school's handbook?
http://orgchem.colorado.edu/Technique/Cheminfo/Physdata.pdf

How do I check if a system of linear equations is consistent or not?

>>6863153
convert to matrix form, then convert to reduce row echelon form, if it is inconsistent, you will see a 0,0,...,0 = 1 line. (ie. 0=1), that makes it inconsistent.

>>6863158
Do you mean in the augmented matrix, if I get [0 0 0 | 1], it is inconsistent?

I got this from wikipedia; "Putting it another way, according to the Rouché–Capelli theorem, any system of equations (overdetermined or otherwise) is inconsistent if the rank of the augmented matrix is greater than the rank of the coefficient matrix."

How do I find the rank of the augmented and coefficient matrices?

>>6863162
Tell me what you think "consistent" means, so I can help with what you are missing.

>>6863165
I'm not sure (the question just asks to check if the given equations are consistent or not), but I think it has to do with them having a solution or if they cannot be solved.

>>6863170
consistent means that there can't be any solution, ie. in one dimension
x=1
x=2
this cant be true. Using the matrix example
you would subtract 1 from 2 and get: 0=1, so it is inconsistent, turns out that this is true for every inconsistent, unsolvable system (exercise: think about this statement, it is 'deep', harder: prove it logically)

note:
x+y+z=1
z=1
This is not inconsistent, there are infinite solutions.

>>6862912
linear algebra

>>6863153
>>6863162
>>6863170
here you go m8

this is from a lecture from a while back which might help you with infinite, unique, and no solutions

>>6863162
Rank is the dimension of the range of the matrix, which is the number of linearly independent columns within the matrix. If the rank of the augmented matrix [ a b c | d ] in a system Ax=d is greater than the rank of the matrix A, [ a b c ] then there is no way to obtain the vector d from any linear combination of the columns of A, which is what Ax is, each entry of x being some scalar. Thus the system is inconsistent.

If light somehow could escape a black holes gravity, what would it look like?

Ok, so I just watched Sal's video about linear combinations and span on youtube.

Now, I've got a question to solve. It's basically
>V1 and V2 are two vectors in Euclidean space
>show that W=(9,2,7) is a linear combination

It's asking me for values of C1 and C2, the linear coefficients, that would yield W, right?

>>6863254
Yeah, exactly, c1*v1+c2*v2=w, for what scalar values c1, c2.

I'm soon heading for university and I still haven't decided on the field I want to study.
My options are:

Business economics
Pharmacy
Process Engineering
Mechanical Engineering
Computer Science
Electrical Engineering
Technical Chemistry
Technical Physics
Maths

I really do have a hard time deciding on what to study, how did you choose your current subject?

I don't need calculus for Linear Algebra right? I want to learn it on my own. I hear it's the latest craze.

>>6863292
Give your list a set of numbers 1 to how many you have. Go to 20 strangers and ask them to pick from the set of numbers the one with the most picks wins

>>6862419
I am looking for a study :/
Only remember the contents, not the year or authors or title or anything. Not sure if the study was in English or Dutch.
Psychology, selection bias.
The researchers had people let themselves divide into pessimists and optimists, after which they let them enter a restaurant or something, with money (banknote, not coin, I thought) strategically located on the floor by the door. The optimists all saw the money and picked it up, while the pessimists didn't notice it.
Hence pessimism/optimism selection bias confirmed.

well im an idiot, i should've seen this thread,

as in the thread i created:

"Hello scientists,

I have a problem with Linear Algebra, maybe you may be able to help me.

Given a square matrix: A.

Prove that if there exists a polynomial

p(0) = 0, and P(A)= I (Identity matrix)

Then, the matrix A can be inverted.
"

Question:
Can radioactive half-lifes be calculated purely from math and quantum physics etc, or can they only be measured from a sample of the substance?

For people with traumatic brain injuries, why don't we inject neuronal stem cells into the dead regions of their brain tissue?

>>6863443
well i don't know the first fucking thing about linear algebra but going off of wikipedia definitions

<span class="math">p(0) = a_{0} I + a_{1} 0 + a_{2} 0^{2} + ... + a_{n} 0^{n} = 0[/spoiler]

must mean that <span class="math">a_{0} = 0[/spoiler] so

<span class="math">p(A) = a_{1} A + a_{2} A^{2} + ... + a_{n} A^{n} = I[/spoiler]

from there i would think there's some method to convert the left hand stuff to the multiplication A by some square matrix B of the same dimensions as A since the definition of "can be inverted is" that there exists some square matrix B such that AB = I

sorry if this is totally off the mark.

>>6863692
Nah you're on the right track. I think you have to use something to do with the Rank of the sums and products, and the Rank of I, to show that it could only be that A has Rank n, so A must be invertible.

How exactly to go about learning qm?

19, taking calc and analytical geometry, and college physics next semester at shit community college before I transfer to a better one(s)

Not certain what to do after that but I do know I'll have to take II and III, fourier analysis, diff. eq's etc but not what order or anything

>>6863721
>at shit community college before I transfer to a better one(s)
That's what they all say.

>>6863652
they are indeed predictable

>>6862441
The result of this is an event horizon, right?

>>6863058
>have an initial escape velocity

Which is nearly impossible since that acceleration would require a MASSIVE force. (unless of course your mass is incredibly tiny)

How the fuck do I approach this? Statistics is such a bitch

How the fuck do I approach something like this? I'm so bad at it

>>6862419
what was the experiment called, where they heat some kind of wire and it gets longer until it hits a point where the cubic crystal system changes from body-centered cubic to face-centered cubic, thus making wire shorter again (even though it is still being heated)

>>6863751
>homework

fuck off and read the sticky.

From someone who never pursued a career in chemistry, why are some salts more soluble than others? I understand that NaCl has high Ksp and is highly soluble and that Pb_2Cl has low Ksp and is insoluble, but I do not understand the physics that explain it. Answers much appreciated.

>>6863771
PbCl_2, whoopsie

would minoring in CS as a CE major help job prospects or be a waste of time, money, and energy

>>6863841
Waste of time, money, and energy.

Either double major in CE and CS to get the credentials, or major in CE and learn CS on your own time, resources abound for that particular topic, especially on the internet, and you can learn it just as thoroughly as if you had minored in it without having to deal with homework, due dates, and grading.

>>6863736
Not exactly. The event horizon is the point at which the escape velocity equals the speed of light.

In reference to the original question, a body could maintain an orbit around a black hole with sufficient speed, but this balance will only last while the event horizon is at the same radius from the center of the black hole (called the Schwarzchild radius). Also, that radius is the point at which not even light can escape the gravitational force, so any planets would have been trapped long before reaching this point.

>>6863738
Ok, so to clarify, if the mass of a rocket/shuttle system reaches a momentum of its instantaneous mass times the escape velocity, can it immediately kill the engine and escape the atmosphere?

I really hate asking for help, but could someone possible help me out with pic related?

>>6863878
solve for r
take derivative
re-read maximums/minimums section of your textbook.

>>6863878
solve for R
take derivative
re-read maximums/minimums section of your textbook.

>>6863882
>>6863883
did you went to the same school?

>>6862419
Does a Vandermonde Matrix always have a non - zero determinant?

i.e- would it be right for me to say the following; "Since the determinant of V is always non zero, then V will always have an inverse"

How would I justify this in calc?

I know the answer is 30 because at 2:30 their distance would be the same away from the dock, making their distance from each other (hypotenuse) the shortest. It's a fairly easy question but how would I go about justifying it in a calculus test?

>>6863878
Solve for R, such as finding common denominator, finding dR, then finding max/min

>>6863987
This is a related rates problem. Set up a triangle. You know how fast two sides of the triangle are changing. You want to minimize the hypotenuse.

>>6863084
There is zero maths in sixth form physics.
There is maths in university physics. A-level is wishy-washy, hand-wavy and shite.

Did you do mechanics in A-Level maths? Think that to start with.

The following 2 questions are from my diff eq course, involving convolutions/dirac delta:
Let x(t) the solution of the first-order linear IVP x˙+p0x=δ(t), x(0)=0, where δ is the Dirac delta.

Show that x(t) is the same as the solution to the first-order linear homogeneous IVP x˙+p0x=0, x(0)=1 for t≥0.

Explain the meaning of your result.

Prove that the zero-state solution to x¨+p0x˙+q0x=δ(t) can be expressed as the convolution x=(k*δ)(t), where k is the Green's kernel for x¨+p0x˙+q0x=0.


I will suck virtual dicks for the answer.

>>6864209
ok for the first part I proved they're equal with Laplace transforms, but I have no fucking clue what that means.

Can somebody explain to me why the quantity on the left equals the quantity on the right?

It's always these autistic little algebra mistakes that fuck me up no matter what I'm doing.

>>6864299
<span class="math">\frac{2^{n+1}-1}{2^n-1} = \frac{2^{n+1}-2+1}{2^n-1} = \frac{2(2^{n}-1)}{2^n-1}+\frac{1}{2^n-1}=2+\frac{1}{2^n-1}[/spoiler]

>>6863144
("Physical...Labs page#)

>>6864367
And " after labs too

Can we harvest energy from the steps that we take? For instance if we were to set up a platform with springs underneath it, would we be able to produce energy by walking across it? If this is a thin, what is the name?

So, I missed out on a class when a specific equation was given to answer a take home test question. Looking online I found an equation, which gave me a good answer. And when I spoke to my classmate about it, I got the same answer, but she used a vastly different equation. Do you think my professor would take off points if I used a different one?

>>6864398
not unless they specifically require a certain method. You can always argue that your way makes more sense, and as long as you're confident and competent in explaining why, they'll let it slide.

>>6864392
>Can we harvest energy from the steps that we take?
Yes, but if you look at the thermodynamics of it, you can harvest only ~10% of the energy of steps, which isn't much (the energy is pretty much the 3cm change in your height). It probably wouldn't be enough to be energy positive (creating the device would take more energy than you would ever get), but there are a couple of things like watches/flashlights that have these things.

Should i get an associates in aerospace technology then my bachelor's aerospace engineering. Or just straight up bachelor in aerospace engineering

>>6863675
Anyone?

>>6862433
>If a black hole has infinite density why does it not consume the entire universe? Infinite density=infinite gravitational pull

Gravitational pull is a function of mass, not density. You can have very little mass and still get infinite density if the cross-section is zero.

Or imagine it this way:

You have a mass M1. It is spherical and homogenous.

Do you need to know the density to calculate the gravitational pull at distance R? No. It does not matter if you have no idea whether this sphere is a 100000 km diameter ball of iron or a half-centimeter ball of neutroniumm, because the gravity is a function of mass M1, mass M2 and R, nothing else.

So if you learn that the mass is actually a zero-meter ball of black hole, it still isn't infinite in gravity - M1, M2 and R did not change when the mass was compressed into a singularity.

>>6862882
>rule of twenty - remove uncertain digits from your tolerance of error by rounding until the number (without decimals) is smaller than 20, inclusive. Then, round your theoretical results to the same decimal place.

>Is smaller than 20, inclusive

1501.0 seems bigger than 20, so that's not what you did. Could you explain in more detail?

Would e.g. 1533 be rounded down to 1520?

>>6863292
>My options are:

Ok real talk: Money is not the key to happiness, but poverty is a real fucking ball buster you would not believe, and even at the "I'm OK" level, another thousand in the bank each month can make things feel a little looser. It's the difference between worrying about your balance and not having to think of it.

It IS possible to be so rich that additional money doesn't increase your happiness by much - many people are at that level - but it's not trivial to get there.

As such: If you have two subjects that are otherwise equally attractive, pick the one with the better employment prospects. Don't pick one you don't like JUST for the employment prospects (A shit job also leads to unhappiness) but among multiple lines that are equally attractive, go for the money.

>>6864708
>Anyone?

Big Pharma automation engineer here:

Medical experiments are fucking expensive to carry all the way to phase III and "inject stem cells" does not sound like a product we can sell to recoup our investment. Get it funded by the government instead, or do your experiments in a country where the laws are less strict.

(And expect to get any medical license you have yoinked from you immediately in (1) that country and (2) back home, and several lawsuits from those patients on whom the therapy didn't work*. I hope you have a third country in mind for where you want to practice after you've published your results.)

*Protip: No therapy is 100% and you'll want far more than 100 people in order for it to be a valid statisical sample so you'll have at least one guy it doesn't work on.

>>6865054
no, you round the tolerance to a number less than 20, noting the number of decimal places required to do so. Then you round your theoretical value to the same number of places.

In the example I gave, my tolerance was rounded to the tenths place (hundreths would be 120), so I then rounded my theoretical result to the tenths place.

given 1533.15 +/- 0.1967 J, the tolerance is rounded to 0.19, so the theoretical result would be left alone.

>>6865054
no, you round the tolerance to a number less than 20, noting the number of decimal places required to do so. Then you round your theoretical value to the same number of places.

In the example I gave, my tolerance was rounded to the tenths place (hundreths would be 120), so I then rounded my theoretical result to the tenths place.

Given 1533.15 +/- 0.1967 J, the tolerance is rounded to 0.20, so the theoretical result would be left alone, with a final result 1533.15 +/- 0.20 J

>>6865200
>no, you round the tolerance to a number less than 20, noting the number of decimal places required to do so. Then you round your theoretical value to the same number of places.


So...

1500 +/- 30 would be rounded to 1500 +/- 20?

Should I study applied physics or engineering? What are the differences?

Is this the Stupid Questions Thread?

I am interested in infectious disease, biology, I want to use lab equipment. I don't want to be a doctor though.
What do I do?
What degree do I get?

>>6863733
Thanks man

>>6865798
Go into synthetic biology, bioengineering, etc

>>6865798
I study biochemistry and its very heavily lab based and you can specialise into infection and pathology if thats what youre interested in. Its a bit heavy on the chemistry for some people though

so my prof wants me to choose one climate archive (sediments, corals, glacial ice, tree rings, forams etc)

and how two of these climate parameters are reconstructed using the climate archive

which one should i use? please help

>>6865949

forgot pic related.

>>6862947
are you kidding me? take chem before you say that... it is VERY calculus dependent, especially when you get to orgo and physchem.

If your doing the dividing, do you put the bottom outside of the thingy when doing it?

Why does high gravity and high velocity cause time dilation?

How would I go about simplifying this?

>>6866131
That's the 4th root of x on the bottom, hard to tell on the picture

>>6866142
rewrite it as (3x)^(-1/4)

>>6866164
Ah ok thanks, that made it easier. =)
I've ended up with 6.75x^8

>>6866184
That's wrong

>>6866191
Where did I go wrong though? I brought the bottom part to the top then added the powers together

>>6866068
nolan pls go

>>6866202
(3x)^(3/4) * (3x)^(-1/4) = (3x)^(2/4) = sqrt(3x)

>>6866229
you missed the x^(3/2) part

>>6866229
>sqrt(3x)
>squirt3x
>squirt 3 times
>other thread some guy has hep B
What the fuck is going on in here?

>>6866239
sqrt is square root, how do you not know that?

>>6866265
lol

If stupid can mean broad or general, how would I go about making myself as smart as someone who goes to MIT, in terms of resources besides MIT OCW of course.

>>6865233
1500 +/- 30 ---> 1500+/-3

>>6865992
Sorry, should have clarified that I was talking about general chemistry (first year college level).

>>6863708
>>6863443

if p(0) = 0 that means there is no constant term in the polynomial. So when you evaluate P(A), the result will be a square matrix with the same dimensions as A. I think you can show that this means that some power of A times some other matrix B = I. B is an inverse matrix. Since A^n has an inverse matrix, det(A^n) is not 0, so det(A) must also not equal zero and be invertable (because powers of matrices only scale determinants)

>>6866003
In long division, yes. The man riding the horse goes into the house, the horse goes outside.

How should I imagine electric voltage? I've never really realised what it exactly is.

>>6866310
Read a lot of science, do a lot of math so that you can understand the majority of science. Pauls Online math notes, Khan academy, most textbooks will help you.

>>6866392
its a potential associated with a position. It is always relative to another position in space.

The units are joules per coulomb. Basically if you have a coulomb of charge and it's at 12v, it has a potential energy of 12J relative to the positions at zero volts. This energy will be converted into kinetic energy if you let go of the charge and cause it to move toward the position v=0, which is why when you have a voltage difference across a resistor or circuit, you get a current (a flow of charge.)

>>6866392
one place with more charge built up compared to another.

>>6866392
think of electricity as water.
think the electrical conductor,wires and etc. as the pipes where the water flows through
think of voltage as the amount of water in the water tank
think of amperage as the water pressure in the pipes

What is the mechanism that causes people to believe nonsense like "if I die, the universe disappears"?

>>6866504
>think of voltage as the amount of water in the water tank

Uh, that doesn't work. That would be charge. Voltage would be like a height difference.

>>6866455
>one place with more charge built up compared to another.

No. That has nothing to do with it.

>>6863771

Solubility is basically a balance between how much the ions in the salt are attracted to each other and how much they're attracted to the solvent.

>>6866665
Tanks are a height difference

>>6866665
>amount of water in a tank
>different from the height difference
that's exactly what head is

>>6866366
>1500 +/- 30 ---> 1500+/-3

...


But that's...

That's wrong. 1500 +/- 30 might come out 1527 or 1482, neither of which are included in 1500 +/-3

Is it the purpose of the rule of twenty to be a wrong rule?

What really happens when one divides by zero?

>>6867110

http://en.wikipedia.org/wiki/Indeterminate_form

>>6862419
is OP a faggot?

>>6867110
>What really happens when one divides by zero?

Real answer: Nothing ever divides by anything. Math isn't real, so nothing "happens."

A slightly more useful question is:

>What should I write on the next line if the previous line had a division by zero?

Because that might actually happen.

And the correct answer is to cross out your work, you're not supposed to divide by zero.

>>6863084
I'm 3rd year uni physics, it becomes very theoretical and maths based unlike 6th form, only do it if that interests you.

>>6863244
White.

>>6863675
Because it doesn't work, as to why it doesn't work? We don't actually know.

>>6863859
no, air resistance would slow it

>>6867181
good answer

>>6867102
I'm going to assume that what they meant to write is

1500 +/- 30 ---> (150.0 +/- 3.0)E1

but that's a fucking dumb way to do it

In my uni's array of arbitrary rules when looking at uncertainty, we always round the uncertainty to one significant digit, unless that digit is 1, in which case you also give the second digit.

so 243.23 +/- 0.02
or 243.234 +/- 0.013

>>6867377

Thank you

what's the rule of twenty? here in netherlands we use significant figures. Makes perfect sense IMO, rule of 20 sounds like some shitty approximation for dumb people.

>>6867387
>unless that digit is 1, in which case you also give the second digit.
this is about as dumb as rouding to 2 decimals except when it's .48 in which case it's just .5
lol

>>6867412
I agree.

This rule was only enforced by 1st year physics department.

It was pretty retarded but at the end of the day you just do what the professor tells you to.

>>6865062 >>6865062
Can I get a decent job if I just study pure math? Do I have to go to academia if I want to do research without selling my soul to the industry?

>>6867452
you can write books if you do it well
IANAM tho

Can I get a decent job if I just studied pure math? Do I need a PhD? Can I do research without going into academia or selling my soul to the industry?

>>6867457
Is that my only option? What does IANAM mean

>>6862419
what the FUCK is quantum gravity?

>>6863292
If you are considering Electrical/Mechanical/Maths, just go for maths, it will be more fun.

I'm doing Mech Engineering and all the thermofluids made me realize maths is more fun.

>>6866649
Failed Philosophy majors.

>>6867462
Yes, probably, no

>>6867502
gravity at the scale of quanta?

>>6864706
Go straight for it.

>>6867541

I believe I should have posted this here. Help me out please! :)

>>6867538
but how and why if you can't ever prove the existence of the graviton

So I have a statistics question, /sci/. If I am comparing a difference of means should I be looking for a p-value or t-value? I know they both prove the significance, but is one better to use?

>>6862419
How do i draw better cells and stuff ? My drawings are always shit and i always have the lowest grade

why do candles produce so much smoke only after you've put them out?

>>6862882
>>6865200
>>6867440
that's the stupidest thing i've ever heard

if you're in any situation where measurement precision matters, then you should be going by the precision indicated by the instruments you're using, not by arbitrary rules like this.

>>6867664
incomplete combustion in the failing ember

Does /sci/ agree with the idea that doctors are scientists?

>>6867732
>Does /sci/ agree with the idea that doctors are scientists?

Medical researchers are scientists. Most doctors are not.

>>6867732
If they publish, yes.

Otherwise, no, no more than an engineer is a scientist. Knowing and applying science doesn't make you a scientist, doing research does.

/sci/ my book is crap and I cant understand Hydrocarbons, for instance.
Let's say I have to write the structure of the
isopropylheptane
or 3-ethyl-3methylpentane

I dont know, how to write the structure because I dont understand the reasoning behind the names and their order.

>>6867537
Does the word academia imply that I I have to teach if I go into it?

>>6862419
Is heroin bad for you?

>>6867755
No, there are research institutes where researchers aren't teachers.

>>6867755
Yes, but once you get a proper professorship you'll only have to teach one or two classes a semester and you'll have a TA to do your grading and no one will care if you are an absolute shit teacher and put in minimal effort and in fact they will expect it

>>6867754
Pentane = 5 Carbons
Draw 5 Carbon atoms in a row, label them 1 through 5

3-ethyl-3-methyl = on the third carbon, there is an ethyl and a methyl group. You might be able to get away with just putting E for ethyl or M for methyl but if not you will need to know that CH3 = methyl, etc.

You just need to memorize what some shit like what isopropyl looks like, and then attach it to a heptane (7 carbons)

>>6862419
I have made perfect and near-perfect scores on all of the exams in my Gen Chem class to date. However, I loath the labs. They just seem so unnecessary.

Does gen chemistry get any better? I enjoy the thermodynamics and gases part of the course, but I don't want to take another semester if its going to be as painstakingly boring and the labs total bullshit like it has been thus far.

>>6867772
>>6867773
Thanks.

>>6867775
thanks anon but surely there must be a system, I mean I know I can look at the book and see that octane is 8 carbon atoms, but I gotta make drawings and or name them, guess I will have to read and repeat.
Damn tests.

>>6867781
Comes down to memorization and practice. Things like OCTane = 8 carbons should be second nature to you. Octagon = 8 sides, Nonagon = 9 sides,etc. so NONane = 9 carbons.

Learning the common names and structure for side groups like T-butyl is a little trickier but there aren't that many.

Good luck on your exams.

>>6866068
because of γ

>>6867781
>thanks anon but surely there must be a system, I mean I know I can look at the book and see that octane is 8 carbon atoms, but I gotta make drawings and or name them, guess I will have to read and repeat.

Well there kind-of is.

The first four you just have to memorize

1: Meth
2: Eth
3: Prop
4: But

After that, there is a system: Greek numbers.

5: Pent (As in the Pentagon, the five-winged building)
6: Hex (As in Hexagram, the six-pointed jewish star of David)
7: Hept (Nothing is fucking spelled with Hept)
8: Oct (As in October - the 8th month of the Roman calendar)
9: Non (As in November - the 9th month of the Roman calendar)
10: Dec (As in deciBel, December, decimeter, decimate and all other words that have something to do with ten)

I always forget that 7 is "heptane" because nobody fucking uses Hept in any other word.

The Enterprise accelerates with 10km/s2 when using its pulsedrive and the max. speed of the enterprise at pulsedrive is 1/4 of the speed of light which is approximately 75000km/s
Does this mean that the Enterprise would need 2h to reach the max speed?

>>6867357
>it doesn't work
According to who?

Hello! Retarded chemistry question, in exercises pertaining dissociation degrees, why is the acid/base at the beginning of the dissolution always referred to as.

concentration x ( 1 - alfa )

where alfa is the degree of dissociation. What does 1 - alfa represent exactly?

>>6868075

alpha*** been living too long in spain

If gravitation is a space-time curvature, is the Earth's surface actually flat and the space around it curved?

>>6863675
There are no dead regions of brain tissue, the damaged cells get replaced by glial scar tissue. Same reason w can't 'just inject neuronal stem cells' to fix a severed spinal cord.

What is the best finite element analysis software for modeling 3d diffusion?

How do you make fancy equations on /sci/ like >>6863692 did? Is there a specific notation?

Do black holes ever die?

Why can't humans have sex in space?

How come climate change denial is practically nonexistent outside of America?

>>6868658
>Do black holes ever die?

Yes. But it takes so long they may as well not.

>Why can't humans have sex in space?

They can.

>>6868521
>If gravitation is a space-time curvature, is the Earth's surface actually flat and the space around it curved?

No.

>>6868659
Because americans are the only ones with the balls

>>6868659

Same reason America is the only developed country with a creationist population...

>>6868665
Why is that?

>I'm american and I still don't know why

Real Analysis is to Single Variable Calculus as _____ is to Multivariable Calculus?

>>6868672
More analysis coupled with some linear algebra?

>>6868669

Extremely piss-poor science education compared to the rest of the world.

Why can't we use plasma for rockets?

>>6868686
we can

http://www.dtic.mil/dtic/tr/fulltext/u2/a283968.pdf

>>6868686
use it for what?

>>6864299
You could always set x = 2^n, so that it's (2x - 1)/(x - 1) which would be a simple matter of synthetic division.

>>6866366
>>6867102
>>6867387
>>6867412
>>6867440
>>6867671

Thanks for the feedback anons. I had a feeling this was an arbitrary rule of thumb sort of rule fed to the lowly undergrads, and this confirms it. I should have known better when I asked about it and got the handwavy response that "it's actually more accurate because it accounts for our small sample size and the inaccuracy of our standard deviation."

And for the record, they actually want the numerical value less than 20. As in .301 is three hundred and one, .30 is thirty, so the only digit we are allowed to use is the .3

I like to program.
I want to create tools/games.
I don't want to program databases or work for companies like intel or google.

I like biology/chemistry/math.
Pathology. Labwork.
Biomedical science.

3rd year student, just got generals out of the way. Would getting a masters in biology or chemistry, and minoring in math and computer science be a bad idea? Or should I just go for the CS degree.

I don't care about being rich

>>6869006
forgot to mention
when I'm old, I wouldn't mind being a professor or teacher

>>6865798
Its called different things at different universities. But a general biology degree, or microbiology would probably be good as a bachelors. You would just have to look at individual professors for grad school

>>6869006
>>6869007
I don't see the point in getting a masters, especially if you want to teach at university you should get a PhD. I guess I'm confused about what you want to do. If you want to be a programmer I would think CS would be the right choice. If you want to write programs for use in scientific research I guess degree in bio or chem with cs minor would be good. If you want to do mathematical modeling a math minor would probably be better

>Why can't humans have sex in space?>>6868658
They can, but shouldn't because radiation would fuck with the fetus.

>>6869043
I like programming. I just don't see myself working for a large company.

Would a company similar to Riot or Mojang (small), hire an intern with a masters in biology but a keen interest in game/program development?

I want to go to school for something academic.
Heck, one of the producers of futurama has a phd in mathmatics

Reading a paper and got confused about the process of polysome immunoselection. Would it go something like:

>Take tissue and centrifuge out polysomes in sucrose environment
>Bind antibody for your target to the complex and separate on a column
>Use oligoDTs to get mature mRNAs from the ones that didn't pass through column and go from there

Math Question:

Find the Derivative of 1/(x+2) using the definition of the derivative.

I know from the formula that it equals -1/(x+2)^2

>>6869061
>Would a company similar to Riot or Mojang (small), hire an intern with a masters in biology but a keen interest in game/program development?
idk, I guess if you have impressive work to show them they probably would.

What happens if you put spaghetti in a black hole?

<span class="math"> int_{0}^{a} d^{3}x \frac{1}{x^{2}} = 4*\pi*a [/spoiler]

it's in one of my books, how does it make any sense?

>>6869461
well I fucked up the integral, but still.

>>6869081
Just go from first principles?
Don't forget to non-rigorously do them limits.

LIGHTNING AND THUNDER AND...?
If I were to be struck by lightning in what order would the following happen? See the lighting, be electrocuted, hear the thunder. Please answer I'm desperate

>>6869737

They all happen at different times, but are effectively simultaneous because those events would occur so fast that on any meaningful timescale to a human being, they'd seem to occur at the same time.

>>6869744
Ok, so I would percieve it simultaneously, but still, in what order does it happen? I get that light tavels faster than sound and therefore we see the lightning and then after we hear the sound, but the energy discharge or the electricity or whatever, at what point does it hitthe ground? Before or afterthe lighting or thunder?

>>6869737
Good question, I hope someone answers.

Why does the resistance of a conductor increase with the increasing temperature, even though increase in temperature should result in more electrons in the conducting band of the conductor?

Studying math as an undergrad. Am prepping to be a quant or something similar. What do I need to learn about CS exactly? From what I read, I need to know C++ and python, but does this mean I just learn programming or do I actually do CS? I dont know much about that field, I can program a little from dicking around on my own in HS. Where do i start and what do i learn if someone says I need to "master C++"?

>>6869948
Ohmic heating. P = R*I^2

>>6869761
Well to "see" something the distance between the origin of what you are seeing and your eyes has to be traveled. Same with the sound. I dont know where the sound originates in thunder; the visible part is originating across many points. If it strikes your eyes (and you could still process the information) the time between when you see it is the time it takes between moving whatever distance remains between its origin and the receptors in your eyes+the time it takes to code this information through the visual processing part of the eye and pass it along to the brain.

Feeling it would consist of the time between your body absorbing the discharge and your body signaling this to the brain. (again assuming you can feel it and the nerves aren't just destroyed, I am not intimately familiar with lightnings physiology on the body)

If a biologist could fill in how long each sensory input takes on average, that would help. IIRC, touch can be passed along quicker than sight.

>>6869952
The more CS you learn, the better. Specifically, in the general direction of machine learning and data analysis, although almost anything in CS will help. You don't really need CS, though, you can get into grad programs without ever taking a single CS class. You do need to be really good at C++, though, you can learn that in a course if you'd like, as I said, more CS coursework always helps, but there's no reason you can't do that on your own.

Your grad program will teach you most of the actual CS concepts you need to do the job, you don't need to be that worried now. Just do your math core, most important is covering that especially linear algebra and taking a mathematical probability course. Any more statistics you take past that is great, same with any more CS or applied math classes, but it's not really necessary.

And if you're not at a top-20 school don't bother trying to find a quant job with just a bachelor's, you'll need at least a masters.

>>6863292
Wow pharmacy, business eco and engineering are very different areas of study.

You can probably shrink that list down by asking yourself if you want to do chemistry, physics or business

I'm studying pharmacy 2nd/3rd year atm, but honestly think i'm more math/equation based. I did really well in physics but chose a chemistry based-subject (small bit of regret)

At the end of the day, your choices here don't decide what you do for the rest of your life

just choose the one you think will be suitable do it instinctivly, and do some research as well, comes down to what your good at, do you enjoy it? and will you apply yourself

don't pick something your bad at cause most of the time you'll struggle and lose interest.

>>6866131
Why the fuck couldn't you type this out in a small world dock, instead go all HD on a little equation

>>6868659
>How come climate change denial is practically nonexistent outside of America?

The problem in America, as seen from the outside, is that it is politicized.

As soon as a political party has an opinion (Even one that seemed good, back when they formed it in the late seventies/early eighties) they can not change their mind on it while the news are focusing on it, because changing your mind is a sign of weakness, not strength, to the average voter.

>>6869005
>Thanks for the feedback anons. I had a feeling this was an arbitrary rule of thumb sort of rule fed to the lowly undergrads, and this confirms it.

OK Real Talk then: Keep using the rule, there's no reason to torpedo your career before it's established.

But keep using it in spite, not in compliance. Ditch it the first chance you get.

>>6862419
Need an simple thing about science to do a presentation about, it doesn't need to be chimpansee-level comprehensible but it should be light and not very extensive

What are some inspirational topics in biology research I can look at to avoid losing interest in science completely?

>>6869737
>If I were to be struck by lightning in what order would the following happen? See the lighting, be electrocuted, hear the thunder. Please answer I'm desperate

Electrocuted, Lightning, Thunder.

The electrocution starts as soon as the lightning reaches you.

The lightning is seen when the light from the bolt reaches your eyes at x1/c later.

The thunder is heard when the noise of the bolt reaches your ears at x2/M later.

Huh, forgot to take my /tg/ name off, sorry about that.

This will come off as stupid but, I am currently a senior in high school (18) and I am anxious as fuck about taking Calc I and II in college. Any advice besides diving into that shit? I am taking precalc now and I honestly fins it very challanging.

>>6867761
Define "bad".

>>6870147
>top 20 school

I am not sadly. I am lucky to live in Chicago though and have a lot of connections in the chicago finance industry, because I enjoy networking. I am currently enrolled at a uni that will let me do a joint degree program, where I begin masters level work senior year. Applying for the program in the spring. I am applying at UChicago as well, hope that works out. I am not settled on Quant or nothing, but I believe the skills acquired in the process are good for a lot of opportunities. What do I look for as course titles in CS? Will they be called machine learning, et al? The last few times Iooked it left me bewildered, I looked up the terms used in the description, but they were meaningless to me.

>>6870345
Space funding
I. Introduce the key players
II. Talk about what they do and what types of people do it
III. Avoid politics, but explain how much is contributed to the fund privately, publicly, and what amount is requested, followed by a brief explanation of how it is spent
IV. Wrap it all up with some anecdotes and talk about the future direction

Bam and the work of making it translatable is done for you. They love pandering this type of information so regular people can understand it

>>6870352
Read 'ignorance' by stuart firestein (sp?). Just google ignorance + science + book + biology + columbia and you should find it. It's 168 pages of light reading, the guy talks about the driving motivations of all kinds of scientists and is himself a neurobiologist. It's a good read

>>6872165
Sorry, I can't give you specifics man, I am in a quant program atm, went the math route though, did math/econ in undergrad and never took a single CS class, closest thing was numerical analysis which had programming homework but was mostly math based and in the math department. CS isn't strictly necessary just very useful. My advice would be take an intro to CS or programming course, make sure it's C++ or VBA as java is completely worthless to you, and from there you'll have a much better idea at least what other courses are.

All that's really critical is taking undergrad real analysis, an upper division mathematical probability course, linear algebra, and learning how to program. Numerical analysis, stochastics, and pretty much any further CS or statistics is very useful but you don't need to worry that much, you'll cover what you need in your quant program.

Also, you said you're in Chicago - the only good quant programs there are IIT and UChicago, if your joint degree is not one of those schools, I'd recommend against it, school reputation is very important for MFE programs and even if it's much cheaper, faster and more convenient to do a shittier one it's likely a bad idea.

>>6868661
Why?

>>6872711

Because the answer to your question is no.

>>6872743
I think he's asking for details, anon.

when you have a magnetic dipole a distance z from a circular current loop, how much current does it induce? or rather what's the magnetic field through the loop (which gives the current I = flux / self-inductance L)

i know how to find the magnetic moment created from a current going through a circular loop but that doesn't help here

>>6872757
>I think he's asking for details, anon.

Details about what? He didn't say why he thought it would be that way, so I can't point out where it's wrong.

I hate my job but I make good money ($80k).

Should I go back to school and get a MS in Subsea engineering or Chemical Engineering (my BS is in this) and then hope to get into a better company / job? Fuck man.

All things considered, is 1960 a bad SAT score? I feel retarded for not cracking 2200.

TLDR - I can take honors ODEs or honors Linear. Which one for CoE major?

I will be taking both classes next semester, but due to scheduling conflicts, I can only take one at the honors level (they are scheduled at the same time, and there's only one section for 30k students)

>>6872195
my problem is that the more I learn about biological and biomedical research, the more "cool" ideas I see swatted down by the realities of the problem or the current existence of said "cool idea".

If single integrals are 2d, double integrals are 3d, what are triple integrals? Why do you use them to take volume? (ie spherical/cylindrical)

>>6873339
>single integrals are 2d
>double integrals are 3d
nah

Finishing calc 4 this quarter, should I take linear or diffy q next?

>>6873191
How long have you been out of shool? Do your current feelings stem from how the job is in your industry or in your company?

Was the moon landing a hoax?

>>6873191
do it. get the fuck out.

I left a decent career because I grew to hate my job, and lost all passion for what I was doing. The day I enrolled was exhilarating. Don't let any perceptions of being too old hold you back, just go for it.

There were 100 baseball and football players at a sports banquet. Given any two athletes, at least one was a baseball player. If at least one athlete was a football player, how many football players were at the banquet?

>>6862419
Regarding the uncertainty principle. Is this due to our inability to measure the values (eg momentum and displacement) or can accurate measures of both just not exist at the same time. Say somehow we were able to measure them without interacting with protons or electrons would we be able to know both these values?

>>6874006
No, it's deeper than that. When we say photons travel in waves we mean just that. Sin waves with a specific frequency which is proportional to the energy (momentum) of the photon. On a graph, a sin wave is infinite in length. No beginning and no end. Can an infinite length wave be said to have a specific position? Can an infinite length wave be said to leave a position or arrive somewhere at a specific time? No, they have no beginning and no end. Now, if you add together multiple sin waves throw Fourier transformations, it's fairly obvious the interference patterns create areas where the total wave is equal to 0, and one area where the wave is not equal to zero, a position. This position is a composite of multiple momenta summed together, as shown in the image. That is the uncertainty principle. It is impossible to know the position of wave of specific momentum, and impossible to know the momentum of a wave with a specific position (and similarly, impossible to know the time of a wave with a specific Energy and the Energy of the wave at a specific time for similar reasons)

Now, you may say, but that is "just math", well, the math makes specific predictions which conform to experiment. Photons travel in waves at c until they interact with other objects at which point that act as Fourier transformed sin waves of non-specific momentum and position.

I've never been to school and i have no education.

What's some good beginners books for physics and maths?

1. Why is green a primary color in light but not in paint?

2. Do ac circuits emit EM waves?
2a. Do electrical sockets emit EM waves?

3. Explain how photons work compared to waves

4. Theoretically, If a proton or electron where to be "shaken around" would it emit an electromagnetic wave?

>>6874333
If you "shake" an electron (give it energy) it will emit a photon (light). This is how fluorescent lights work.

>>6873790
>There were 100 baseball and football players at a sports banquet. Given any two athletes, at least one was a baseball player. If at least one athlete was a football player, how many football players were at the banquet?

Exactly one.

>>6874329
>1. Why is green a primary color in light but not in paint?

Because paint is subtractive. Meaning, "green" paint absorbs everything except green light, which it reflects. That leaves you nothing more to subtract except more green. (In contrast, "yellow" paint reflects both red and green wavelengths, so you can mix it with other color paints to change the color.)

>2. Do ac circuits emit EM waves?
>2a. Do electrical sockets emit EM waves?

Yes, with very, very, very little energy.

>3. Explain how photons work compared to waves

Much too big a question for this thread, really. But I'll just say that photons are simply quantized waves.
>2. Do ac circuits emit EM waves?
>2a. Do electrical sockets emit EM waves?
>3. Explain how photons work compared to waves

I want to get into Computer Engineering. I noticed that the /sci/ learning sections only had CS, EE, and ME. Should I read through all of these or is there a source for specifically Computer Engineering?

I understand that CE comprises of all 3 (so, of course I'm gonna dig into those anyway), any others?

>>6863054
It depends how you define length

>>6864392
>>6864575
http://www.cnn.com/2011/10/13/tech/innovation/pavegen-kinetic-pavements/

>>6873153
none? Your magnetic dipole has a static magnetic flux density at distance r. Currents are induced by a time dependant flux.

When quantum particles "barrow energy from the future", can that ever lead to them taking weird paths because some potentials would create a paradox?

is self-studying for an hour or two a day (specificlly math) enough? its mostly brushing up on preliminary stuff (lots of Halmos, Lang's "Algebra"), and even in that short time a day im breezing through it.

I'm a junior year math major, switched from Engineering and trying to cover my bases. jumped into Topology and landed on my ass.

i'm in complex analysis and I'm doing pretty well, yet I can't do shit like this involving geometry and trig.

What books should I read so I can git gud at this?

>>6862419
integral of sin (x^2)

captcha:sitemba polygastric

>>6875681
I already told you in the other thread faggot.

>>6875681
It has no closed form solution, nerdlord.

Can anyone give me an intuitive explanation of what uniform convergence is and why it's important?

Is teaching high school a somewhat satisfying job?

>>6875789
TOP KEK
O
P

K
E
K

I took a blood glucose test, then drank a sugary drink, then took the test again and my blood sugar went down after i drank the drink. What does this mean? i cant wait till monday to talk to doctor.

>>6875653
Is this normal trig/geometry or is this trig/geometry on the complex plane?

If the former then pick up the cliff's notes books on geometry and trig (they're tiny, cover all the important topics, and you can blow through them crazy fast). If the latter then pick up Visual Complex Analysis.

On the off-chance that this is constructive geometry then pick up The Art of the Infinite (not really about constructive geometry, but covers it and a bunch of other geometry intuition, also just a pop-math book) or pick up Famous Problems of Mathematics by Benjamin Bold (this book is all on constructive geometry and it's pretty rigorous, though it requires a non-trivial amount of effort to work through.

>>6863771
It is determined by Gibbs free energy change.

Is dark matter affected by absolute zero?

>>6874244
How much algebra and calculus do you know?

>>6875824
uh insulin was released

>>6867778
I got to make bouncy balls in my labs.

>>6875882
i would have thought that blood sugar levels would be slightly higher after having a sugary drink than they were after fasting for 8 hours. no?

>>6875891
Well it depends when you took the blood test. If you took it as soon as you drank the drink then your blood sugar level drops because your body released hormones in reaction to you taking food. These hormones then produce insulin to remove glucose from the blood and into the cells. If you took the test after waiting for some time then your glucose levels should have been higher than before eating.

>>6875906
took the second test 1 hour after drinking it. didnt take the third test 2 hours after drinking it because the nurses didnt think it was necessary though i heard one guy say that his blood sugar levels continued to drop for both tests after his drink. I am worried i am not breaking down sugar correctly or something. not sure.

>>6875943
Well you should be fine unless you have some metabolic disorder, and those are quite rare to have. But your metabolism is probably the reason why your glucose levels were lower during the second test.

I'm sorry if it's alreayd been asked in this thread, but is it true that science can't explain how bicycles stay up? Specifically, why it takes so much energy to tilt a spinning wheel? I can't understand it personally.

What are the complex roots of the polynomial x^4 - x^2 + 1?

>>6876053
>how bicycles stay up?
There's a human balancing it, also it moves forward which is stabilizing, also gyroscopic effects.

>why it takes so much energy to tilt a spinning wheel?

Gyroscopic forces are well studied and not the main reason bikes stay up, it just contributes a minor stabilizing effect.

There's studies made on this. go find them.

>>6876056
Do you even Wolfram Alpha?
http://www.wolframalpha.com/input/?i=roots%20of%20x^4%20-%20x^2%20%2B%201

How would someone go about obtaining one of these. I'd love to get into some mad scientist research if I can.

Why isn't /sci/ a more active board?

>>6876067
because elite

>>6874855
what about a proton? or both t the same time(neutral charge)

>>6876065
Planned parenthood

>>6876987
I don't know, I don't think anything special happens though.

Any linguists around?

I'm looking for a fancy adjective for someone who has this air of amused indifference towards anything

Eg. a person who just got their leg bitten off by a dinosaur going "Huh, would you look at that!"

Sort of nonchalant but more intrigued I guess. Getting tip-of-the-tongue here but I just can't seem to resolve it.

>>6862433
First of all, black holes do not have infinite density.

Second, gravity is proportional to mass, not density.

Third, black holes do not go around actively sucking shit up like a shop vac. Things that get too close just get pulled in, and once they get pulled past the event horizon, they stay in.

A singularity can never have a truly infinite gravitational pull as the amount of mass in the universe is finite.

The density of a black hole is irrelevant, super massive black holes often have a density that Is similar to that of water.

>>6862441
Volume of a black hole increases as mass grows

>>6862843
You only need to reach escape velocity momentarily

Need to integrate sin(x^2)/x

Wat do? Please guys

>>6877052
Insouscient

>>6869948
Phonon scattering. Simply put, the disorder of the atomic lattice increases more with temperature than the population of conduction band electrons (for simple metallic conduction). The opposite is true for semiconductors.

>>6877139
Get a computer to do it for you. Alternatively integrate by substitution, but I'm not sure that would actually help you out here.

>>6862945
All the time

>>6863054
You may be confusing distance with displacement

>>6863073
The movie had a lot to do with the concept of time dilation. the scientific concept is fairly simple, as the strength of a gravitational field increases, time begins to pass slower.


>>6863244
You misunderstand how black holes work. the extreme mass of a black hole distorts time and space. The distortion makes it so that all light like paths point towards the singularity. The light is still passing in a straight line relative to the curvature of space and due to that curvature, all lines end at the singularity. It is much easier to explain this in person.

>>6863652
Everything can be calculated with quantum physics, the problem is that we don't have a complete understanding of quantum mechanics nor do we have the resources required to make some predictions.

>>6877191
Thank you!

>>6877376
Avec plaisir ... I'm pretty sure it's French for "doesn't give a f**k."

I'm working on procedural character animation I'm trying to label the variables of my hip motion

I use pitch roll yaw for the rotation and sway, bounce, <????> for the position.
What is a good term for thrusting your hips back and forth?

>thrust

lol, I post this anyway to demonstrate how stupid questions get solved ITT.

>>6877461
>What is a good term for thrusting your hips back and forth?
dickhunger

>>6877461
fuck-cycles

How do you do the dot product of two polynomials with N independent variables?

Is it correct to interpret the uncertainty principle, as the statement that there is a finite limit as to how well the state of any system, even beyond the context of quantum mechanics, can be known?

This question has to do with the alcubierre drive that is starting to become less and less theoretical

lets say I have a spacecraft that activates the drive and moves from star A to star B. The drive naturally doesn't accelerate the spacecraft at all, it just moves space around it.

So the question is, what velocity does it have upon deactivating the warp field? Since velocity has to be relative to something I don't know how it would translate across stars. Additionally, I'd be interested to know how matter and light would interact with the field, would it get bent around it?

>>6877461
twerk/second (Tw/s) the variable used

Should I start from the ground up on khan academy to build a good foundation for college maths? I struggle as heck with algebra at the moment

>>6864046
Mechanics was my favourite module. I got 100 and 95 in M1 and M2 respectively

>>6878676
Yeah, Khan Academy is pretty good. I went to college years ago (when the internet was a curiosity and served no practical purpose for most people) and couldn't look up any kind of help online. Believe me, Khan Academy is much better instruction than most of what you will receive in the classroom. Also use PurpleMath and SOSmath. They usually explain things pretty well too.

http://mathworld.wolfram.com/ConvergentSeries.html
" If sumu_k and sumv_k are convergent series, then sum(u_k+v_k) and sum(u_k-v_k) are convergent."
Is there a name for this statement?
It's just that I wish to quote it in a proof.

I don't have a question but I want to vent
Fuck MyMathLab with a fucking burning passion. Why doesn't my university use something like Khan Academy which is way better? Or why can't my calc instructor just fucking grade the homework we do on paper? Fuck whoever decided that MyMathLab was a good idea for universities.