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/sci/ - Science & Math

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2372178 No.2372178 [Reply] [Original]

You know the deal /sci/
You post physics questions
I answer them (if they arent too fucking retarded)


Any takers?

>> No.2372191

How many bert stein pics do you have?
Also, how do light polarizers work?

>> No.2372194

Why are you qualified to answer physics questions? Please answer with an equation, and make sure the units are in kg/m^4.

>> No.2372198

Hey, I have a question. A friend of mine said to me that you can open a refrigerator door easily but if you close it and then try to open it a second time, it will pose more of a physical challenge. He said that it was because of physics but refused to explain what was actually going on. Can you explain that to me?

>> No.2372210

>>2372198

When you close the fridge, some air escapes creating a lower air pressure inside the fridge making it harder to open, also your friend is a homosex.

>> No.2372229

>>2372198
its cause the cool air will compress

>> No.2372233

>>2372210
Ah, thank you. That makes sense.

>> No.2372239
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2372239

>>2372194
>Why are you qualified to answer physics questions?

I am a physicist, with shit-tons of experience.

>> No.2372248

We worked a problem in physics that measured the energy required to keep all the protons and electrons in an orange apart by one mile and it turned out to be something like 68 * 10 ^18 tons or something like that.

So my question is this:
Obviously we all are made up of a huge number of electrons and protons and these forces are creating a huge electrical field between each other and everything on the earth, only most of it is cancelled because we are made of of both, almost equally.

Is there some form of energy constantly travelling through all of us that is getting cancelled out or perhaps carrier particles or something?

>> No.2372249

I heard from some guy in a wheelchair that the laws of nature go wonky when you compress all existence into a single point. Can you expound on this point?

>> No.2372263

Bump.
Tips for a highschoolfag who plans to major in physics?

>> No.2372265

Why can't you go faster than light, and why does shit get so fucked up when you go around the speed of light?

>> No.2372268

>>2372263
get started early
and you better be good at math, physics, and chem as they all come together in a lot of ways.

>> No.2372275

>>2372265
the amount of energy required to accelerate an object of mass to the speed of light is infinite.

>> No.2372277

he who thinks himself wise, O heavens! is a great fool - Voltaire

>> No.2372278

>>2372277
irony

>> No.2372282

how do magnets work?

>> No.2372284

>>2372275

so basically, we cant EVER travel at the speed of light?

so space travel will never work?

>> No.2372291

>>2372284
so far, no. But it doesn't mean more imagination and creativity can't come up with unique solutions.

>> No.2372292
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2372292

>>2372248
>only most of it is cancelled

Not really. EM is resonsible for the majority of phenomina we observe on earth. Most notably chemistry. Chemisty directly arises from EM.

>Is there some form of energy constantly travelling through all of us

There are certain particles that travel through us with little or no interaction at all, Ex Muons. Although, this isn't really related to anything you were saying.

Anythine else?

>> No.2372296

dubs says ur a fag

>> No.2372301

Explain this.
>>2371598

>> No.2372303

when you copress a spring and put it in acid wear does the energy go

>> No.2372304

>>2372284
Depends what you mean by "work". Interstellar colonization is still possible without breaking the speed of light, but it'll sure take a lot longer.

The reason things get fucked up when you go near C is that no matter how fast you're going the speed of light appears to be constant from your point of view.

>> No.2372306
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2372306

>>2372263
>advice

Study some pure mathematics in advanced (maybe just on your own). It will make your studies easier.

Join the SPS and APS, even before you go to college. Try and read at least one Phyiscs today article every few weeks.

>> No.2372315
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2372315

Is there a theory in physics which supports Creationism scientifically in any way?

>> No.2372317

>>2372304

by work i mean like, extremely fast travel, without like hibernating and shit

also please explain speed of light relative to point of view i dont quite get that

>> No.2372323

what do you think about the limits of human technology? will we travel the universe(s)?
they say cold fusion is possible, what do you think?

>> No.2372324

When you compress a spring it has more potential energy.

E=m(c^2)

energy has increased, lightspeed is constant, so that means mass has also increased.

Mass has been created.

>> No.2372326

>>2372306
I've been studying calculus on my own for a while now. My aunt gave me a big ass text book from her college days that pretty much covers Calc I-III. Also, will I have a social life in college or will it be the grueling lucky-to-get-4-hours-of-sleep work load that I've heard some people claim?

>> No.2372328
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2372328

>>2372249
All physics uses the least action principle (and the assocaited cal of variations) on a fundemental level.

The Least action "breaks down" for just a "point". That is probably what your wheelchair friend ment.

>> No.2372331

When a spring w/ mass is compressed, what will the forces that it produces on both ends be? Does it depend on how the spring is moving? What if one end is attached to a wall? And what will the spring's potential energy be? Thanks a lot, and the more derivations, the better! :)

>> No.2372334

so basically, we cant EVER travel at the speed of light?

so space travel will never work?

Fail, there is a difference between going to space and traveling at the speed of light... just might take a while.

>> No.2372341
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2372341

>>2372326
>Also, will I have a social life in college

Yes

>the grueling lucky-to-get-4-hours-of-sleep work load that I've heard some people claim?

That is only what dumb people claim

>> No.2372345

>>2372324
Compressing the spring does nothing to alter the properties of matter itself- just the macro state of the spring. The atoms and shit still have the same energy and properties. You wanna use Newton for that shit.

An F physicsfagstudent here.

>> No.2372350

>>2372178

http://pesn.com/2011/01/17/9501746_Focardi-Rossi_10_kW_cold_fusion_prepping_for_market/

Could this be for real or are we having our leg pulled once again?

>> No.2372355

How does a Bose–Einstein condensate work?

>> No.2372364

In the Oberth effect, the propellant of a rocket experiences a gain in specific energy as velocity increases. Does this mean it becomes more efficient, or that it accelerates faster? And what happens to the exhaust?
Also, according to the whole equation (which I pulled off wikipedia):
dS/dt = v * (F/M)
If I wanted to find the antiderivative with respect to time, is it S = d * v? Because I can't make any sense of what I came up with.

>> No.2372374
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2372374

>>2372350
Don't trust shitty websites that make extrodinary claims. That website is not presenting peer-reviewed science. It is likely all bullshit.

The only people who are scared of peer-reviewed science are those who spout nonsense.

>> No.2372376

>>2372317
Special Relativity.

Basically, the theory is that the laws of physics work exactly the same way whether you're on Earth, on another planet with a velocity 100 km/s different or a space ship traveling at 99% the speed of light: there isn't some magic spot that's "perfectly at rest" that all the rest of the universe is measured by.

One of the MAJOR consequences of this is that no matter how fast you're going the speed of light in a vacuum relative to you is always the same. This leads to time dilation, length contraction (from the point of view of someone relative to who you're in motion), and all that other weird shit.

>> No.2372384

From what I understand, Hawking radiation is matter/antimatter pairs which form spontaneously all the time and then merge back together, but fail to due to the event horizon.

Are there any other times when these matter/antimatter pairs can be observed, or have some kind of consequence?

>> No.2372388

When entropy increases, what does randomness imply? Is it probabilistic randomness of the behaviour of a system or is it just a lack of order? (high school physicsfag here; looking to major in physics)

>> No.2372398

can u explain how time travel works or y it cant work.

>> No.2372402

>>2372376
Note, btw, that it's a "theory" in the same way we have a "theory of gravity": there are MANY predictions made by special and general relativity that are experimentally proven.

If your heart is really set on high-speed space travel cross your fingers and hope we can make stable wormholes. It's a longshot, but the the likeliest way according to our current understanding of physics.

>> No.2372406

>>2372374
They are however NOT scared of putting their inventions on the market. And forgive me, I have a rather greater trust for the unbiased laws of profit then the state- subventioned, brain-neutered academia. In other words, I'll just wait and see what the darn things do in the REAL world.

>> No.2372411
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2372411

>>2372265
>Why can't you go faster than light

Causaility, and energy requirements.

>why does shit get so fucked up when you go around the speed of light?

Space and time compensate for eachother in order to prevent massive objects from reaching the speed of light. If I keep pushing an object to go faster, the universe will make it slower by changing the scale of time.

>> No.2372412

>>2372374
Sounds fair enough. Curious, do you think that muon catalyzed fusion has a place for energy production in the coming century?

>> No.2372413

>>2372384
Plz anserr this

>> No.2372418

>>2372364
Bump for this

>> No.2372422

>>2372384
Basically, but it's any particle-antiparticle pair. "Matter" suggests protons, neutrons, etc which generally doesn't work for a number of reasons.

I don't believe we see it elsewhere but I might be wrong; I'm not THE physics guy in this thread.

>> No.2372425

How do magnets work?

>> No.2372427
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2372427

why wouldn't this work

>> No.2372431
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2372431

>>2372406
>greater trust for the unbiased laws of profit

LMAO

You want to buy some magic beans? I will give you a great deal!

>> No.2372440

What does it mean for many particles to be in the exact same quantum state?

>> No.2372445

What are the strings in string theory made of? They are like bent space, like the event horizon from the singularity generated from the mass? Can black holes surface have normal mode?

>> No.2372453

Just now learning some very introductory thermodynamics, so this may be easy to explain: why is the cap efficiency for stuff always around 20%?

>> No.2372454

>>2372431
Sell him a perpetual motion machine while you're at it!

>> No.2372476

>>2372411
would it be similar to, if we were made of "sound waves going in circles" we would work slower if moving fast because the sum of our body velocity with that of our "sound waves moving in circles" must be equal to the speed of sound? From the equations it seems to me that this is what happens, but teachers say that Im wrong, but I didnt get any good explanation up to now,

>> No.2372479
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2372479

>>2372427

>> No.2372481

>>2372427
The force generated by the magnets has to be greater than your mass, and you have to hold onto the damn things, perfectly balanced. If you can lift yourself up for an extended period of time, its not impossible, but just stupid

>> No.2372489
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2372489

Which do you trust more? Conservation of energy or conservation of momentum?

Where's a good place to work with a physics diploma if you're dumb?

>> No.2372499

>>2372481
>implying the magnets would not just stick to the metal plate immediately.
>implying it would EVER move ANYWHERE.

Nope.

>> No.2372503

>>2372364
It is just extra kinetic energy, since the fuel is in motion.

>Does this mean it becomes more efficient

It really depends on how you define efficient.
In terms of the orginal efficency of the fuel, it will seem more efficient. However, in terms of itself, it is not.

>dS/dt = v * (F/M), antiderivative with respect to time, is it S = d * v?

Not in general (mathematically). I don't know enough about your specific varibles to tell you. Do your own homework.

>> No.2372506

>>2372479

lol Problem, Statics?

>> No.2372511

>>2372326
They are exaggerating.But it will be way harder than other things you could made, like engineering.

>> No.2372512

>>2372476
Ow, my brain.

Please review the post on special relativity.

>> No.2372515
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2372515

>>2372489
>Which do you trust more? Conservation of energy or conservation of momentum?

None.
Those conservation laws only work in very specific physical systems. They do not work in general.

>Where's a good place to work with a physics diploma if you're dumb?

You can work as an engineer in industry, or teaching highschool.

>> No.2372521

>>2372499
im saying all it would take would be someone strong enough to prevent the magnets from sticking to the plate

>> No.2372523

>>2372178
What's your opinion on Walter Lewin? Although I don't understand much of what he says as I'm still in high school, I still love watching his lectures online. He seems like a great teacher and the way he presents himself just makes it so interesting.

>> No.2372524

>>2372512
sup..invalidate it, them

>> No.2372526

>>2372431
Typicall ignorance and bull-headedness.

Sure, give me a pair. But, seeing as your product is certainly a novelty, and, excuse me, makes rather far-fetched promises of its usefullness, I'm sure you would agree that asking me to pay the full price for it would be overly optimistic? In fact, I think that you should first prove that your product works in a plausible way, and by that I mean, do field tests, and then sell some copies at a significant discount, or perhaps even distribute some for free among chosen partners to use in their enterprises. Of course, if in this time your product proves to be, lets say, less than promised, I would demand a full refund, which we would cover in our agreement prior to purchase. I imagine that in sucha case, your reputation as an entrepreneur would be forever ruined, along with your chances of selling ANYTHING ever again, even if its just a toothbrush.

THAT is what I mean, you stupid fucking idiot. In the real world, on the free market, if you lie to people, they make you pay. Unless of course, if you have the full coercive and propagandising power of the state at your beck and call, not at all unlike you ivory-tower academics have at the moment...

>> No.2372528

How would you go about modifying the mass to mol conversion to account for velocity?

>> No.2372530

>>2372511
If you consider "study groups" to be social life you'll be golden.

Also you could hang out with math majors. They'll understand you and they looove to get stoned.

>> No.2372533

>>2372178

Contemplating taking some physics courses in uni (perhaps a minor), got great marks and understanding in chem and math, but have yet to take physics in high school. (school budget small can only offer physics every 2 years) I don't know a lot about the depth of physics but i have some basis that i know of and that i find extremely interesting.

Think i'd be okay for physics?

>> No.2372535

>>2372521
He be trollin. Or really stupid.

>> No.2372536

>>2372526
Okay, great.

Now apply your logic to cold fusion/water powered car/whatever websites and see where it gets you.

>> No.2372539
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2372539

>>2372178
What exactly is a tensor?

>> No.2372543

Why does stuff fall down when you throw it in the air?

>> No.2372544
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2372544

>>2372523
Never heard of him before.
He looks like a cool dude, he has done some pretty good science, and won a few teaching awards.

Looks like he has a real knack for teaching, meaning he probably know his shit on a very deep fundemental level.

>> No.2372547

>>2372533
Yea; you'll need to work pretty hard but physics 101 is all very basic stuff.

>> No.2372549

>>2372535
It wouldn't work indefinitely, but it would still work.

The energy comes from you, as the holder of the magnets

>> No.2372554

>>2372547
Also, it'll really help if you've got a good understanding of calculus; a whooole lot of physics equations are derivatives/integrals of one another.

>> No.2372563

Would you mind ,if not answering,saying at least why the questuions youre not anwering are retarded?

>> No.2372570

>>2372536
1- I wait for test results that give me a fair hope of at least making even on my investment, preferably far, far more.
2- If I judge the test results to be good enough to justify the ever present risk of getting scammed, I invest, taking precautions not to get fucked over.
3- I check it out myself. If it works, great, my investment payed off. If I get scammed, I lose some venture capital (not a big deal), and also I do everything in my power that the assholes have no business this side of the Milky Way ever again.

Btw, a website is not enough to interest me at a business level, so your question is really moot. But hey, fuck it.

>> No.2372581
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2372581

>>2372539
A type of mathematical object.

A Tensor is a multidimensionl object, filled with "slots". Each slot can contain more objects.

It is used as a generalization of the "scalar", "vector", and "matrix" to higher "dimensions" (or the same dimension).

If you know computer programming it is analagous to arrays (or nested arrays).

>> No.2372583

What is the that a single photon makes when i contacts an object... can i see the math please as well ive been working on it but i cant figure it out. you know cause they have no mass but have mass on impact and i dont know the equation.. I tried deriving some of einsteiens equations then crossing it with keplers derevations and then got no were...

>> No.2372584

>>2372549
Lolno
The force of you pulling up on the magnets comes from the force of your feet pushing down on the metal plate. This force is (you guessed it) exactly equal and opposite of the force applied by the plate pushing you up.
It's the same reason you can't grab yourself by the hair and lift yourself off the ground.

>> No.2372593

Here's a semi-retarded question from a laymen.

Is there a point where physics gets so complicated that basically people are just making shit up? Is Quantum Mechanics related to physics?

>> No.2372595

>>2372526
Someone's read too much Ayn Rand.

But on a serious note, people are stupid. A clever asshole can make a fortune selling bullshit merchandise that doesn't really do anything. And while the bullshit that people try to pass off as a cure-all or dick-enlargement is often weeded out by the free market it just as often isn't. So when deciding whether or not to buy something the best move is to see what accepted, peer-reviewed scientific research has to say about it, when possible of course.

>> No.2372596

Not a question directly related to physics itself, but how's the money for non teaching positions, be it R&D or anything that isn't teaching.

>> No.2372600

>>2372539
Herp derpest level: a collection of vectors somehow related together.

>> No.2372605
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2372605

>>2372563
Nope. I usually just ignore the retarded shit and assume it as trollin.

>> No.2372613

Is there a limit rate of electric field intensity variation on time?

>> No.2372615
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2372615

is time and gravity linked? then do you think like others gravitation can be assimilated, simplificated by a particle model (so it fits with electro, weak and strong interactions - so happy together) or are things slightly more fussed ?

>> No.2372616

>>2372595
Only time will tell. Supposedly, their are recreations going on now, and this experiment is only an expansion of what they have been working on for the last 15 years. I have no reason to doubt that they made some sort of discovery, but I would call "cold fusion" a stretch. (At least, in this venture)
~Original Question Asker

>> No.2372619

>>2372593
Nothing widely accepted is ever just random made-up shit. That doesn't mean the media doesn't make up shit when conveying these ideas to the public.
Quantum mechanics is tried and tested daily; it still holds up. There are really only two axioms that drive it: 1. All particles are also waves; 2. All particles are "quantized" (i.e. they come in discrete packets).

>> No.2372624

>>2372605
but you answered the cold fusion thing...an obvious troll, and my relativity question you didnt answer

>> No.2372627

>>2372265

You can't go faster than the speed of light because as you approach that speed time dilates (or slows down), and the closer you get to the speed of light the greater the dilation.

However, this doesn't mean you can't get to the other side of the galaxy in a human lifetime. It's just when you get there, the rest of the universe will have aged a bunch.

The reality of this is that when you travel at near light speed you desynchronize your 'clock' from the rest of the universe.

The real problem with near lightspeed travel is all the shit you'll be flying through, cause it'll be hitting you at 99.9999999% the speed of light and that stuff will wreck your enterprise.

>> No.2372628

>>2372178
Can you, in very basic terms, explain to me electron pair production? Or electron-positron annihilation?
Does this happen all the time in nature, are there any consequences or any major effects?
Sorry if this is retarded, but I'm trying to understand.

>> No.2372632

>>2372595
An excellent point, I admit. Trouble is, there ARE no unbiased authorities in the energy department. Or the environment, or the economy. Grants are awarded according to certain political considerations, and that means the economic incentive is on the side of some avenues of research at the cost of others. For example- its not "finding a new, clean energy source", its "finding ways of utilising oil more effectively", or "estimating remaining energy reserves". You want a grant, you better make damn sure you phrase your problem the right way. And come at acceptable conclusions. So its back to nuts and bolts risk managment principles. Most people dont know them? Hey, why the FUCK should I care? They'll learn sooner or later, anyway, and be the wiser for it. Even if there will be less of them left.

>> No.2372636
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2372636

>>2372593
>Is there a point where physics gets so complicated that basically people are just making shit up?

Nope

>Quantum Mechanics

Yes, Quantum Mech is one of the pillars of physics. It work very very well in explanation of phenomina, as well as beign able to predict phenomina. In fact, it is one of the most sucessful scientific theories ever made by man.

Most modern technology was developed using quantum mechanics, example microchips.

>> No.2372643

Could you explain to me what supersymmetry is?

>> No.2372646

>>2372615
I read somewhere that a pure geometric union of the 4 forces was once formulated (extending the gravitational model to more dimensions), and it worked at first glance but on a deeper level it failed somehow. The math was beyond me so I don't know exactly what was wrong, and that doesn't mean a different model couldn't pop up later.

>> No.2372652

>>2372616
I'm not sure what that has to do with what I was saying in >>2372595.
I was only pointing out that the free market isn't always sufficient to weed out the bullshit snake-oil merchandise that so often ends up making money and that, when deciding on an investment, it's best to find out what kind of research has been done within the scientific community on the subject.

>> No.2372659
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2372659

>>2372624
>but you answered the cold fusion thing...an obvious troll

Initially, thought it was a confused little kid, my bad. I have since stop responding to it.

>and my relativity question you didnt answer

What question?

>> No.2372662

is there a limit on acceleration?

>> No.2372664

>>2372646
perhaps some things are simply more than just a force, but the tissue itself of the universe. where time and energies flows on it.
i won't write a theory 'cause i suck at that.

>> No.2372669

How important is it to have a programming language under your belt if you are going to major in math/physics in college? Learning Java now, maybe Python. Tried Wolfram Alpha, but the software is too hard to get (our school doesn't have a license, it can't even buy fucking paper for the printers)

>> No.2372680

>>2372659
Yep, an idiot. I bail.

>> No.2372694

>>2372659
No offense, but I am not naive. I don't believe that cold fusion is possible in any traditional sense that we can picture. Maybe, mimicking the effects....but not actual cold fusion. I was merely commenting on this update and the possibility that they are willing to put their money where their mouth was by exposing their machine instead of hiding it. (Again, more info supposedly to be released after the patent is finalized)

>> No.2372698

>>2372643
Supersymmetry is basically an assumption about the Standard Model of particle physics that predicts that nature adheres to certain "hidden" symmetries. In this case, a "symmetry" is where you could replace every particle of one type in the universe with another type and the laws of physics would remain unchanged. These "supersymmetric partners" are postulated to have certain properties that fill gaps in our current model nicely.
It's kinda like how every particle has an antiparticle, but it's just a different symmetry than reflection of charge.

>> No.2372702
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2372702

>>2372628
>very basic terms, explain to me electron pair production? Or electron-positron annihilation?

Basic Terms? What do you mean by basic? Like basic physics? Or basic for the common man?

>Does this happen all the time in nature

Yes

>are there any consequences or any major effects?

These are fundemental processes, they are happeening all the time, everywhere. Without them you would not have chemistry, and all the shit chemisty imples (including biology).

>> No.2372710

>>2372698
Explain to me the spin crap. Because that is the confusing part.

>> No.2372715

>>2372659
Even on that note, I was being serious and asking about muon catalyzed fusion. Who else would be more qualified to answer a question on muon creation and production than a physicist. I really have an interest in these fields, but have yet to obtain that level of education. (still in undergrad studies)

>> No.2372716

>>2372659
It may be silly, but I cant deal with it:
would it be similar to, if we were made of "sound waves going in circles" we would work slower if moving fast because the sum of our body velocity with that of our "sound waves moving in circles" must be equal to the speed of sound? From the equations it seems to me that this is what happens, but teachers say that Im wrong, but I didnt get any good explanation up to now,

>> No.2372727

>>2372662
Assuming a finite amount of energy in the universe, yes.

>> No.2372731

Is there any physical proof for what we call a "soul" besides the neurons in our brain? Serious question. I don't mean in metaphysical terms, perhaps in quantum terms? Is there anything unique that accumulates outside or inside our physical bodies in that way? Or any studies being done on it? Theories? Etc.

>> No.2372737
File: 1.27 MB, 2327x3000, einstein2.jpg [View same] [iqdb] [saucenao] [google]
2372737

>>2372643

This is a good answer >>2372698.
Additionally, I woudl add that the standard model is really 2 seperate models, The electroweak, and the chromatic. Supersymmetery is a propsed theory that links the two, giving a truly unified 3 force model.

>> No.2372746

I don't get it. This thread sucks. This physics guy sucks ass and gives dumbshit responses.

>> No.2372749

>>2372727
Reflect please.Its rare when someone who really knows something appears here, and you people keep trolling.Why not porn? I can indicate you good sites If you dont know

>> No.2372763

>>2372746
He is acting weird today..not answering lot of questions..klack of details..maybe is someone impersonating him

>> No.2372784

>>2372710
Spin is just that: spin.
It's an inherent, quantized (meaning it has discrete units, not a continuous range--only specific values are possible) angular momentum associated with any particle. I don't know how it plays into supersymmetry that well, only that certain groups of particles have the same spin. Bosons (including the force particles) have integer spins, and fermions (including matter particles) have half-integer spin.

>> No.2372807

In your opinion, what has been the greatest breakthough(s) in mathematics or physics?

>> No.2372810

I too am a physicist. What is your area of study?

>> No.2372816
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2372816

>>2372731
Nope to all your questions.

In science you try to explain a phenomina and how it operates. If there is no observable phenomina (soul) in the first place, you don't theorize about it.

Would you use physics to try and disprove Santa Clause?, nope. There is no evidence for Santa Clause in the first place.

I won't respond anymore more on this subject. I suggest you go over basic logic and the scientific method, if my answer doesn't make sense to you.

>> No.2372825

If the universe is expanding (dots on a ballon theory)
then why arent we expanding? our bodies, homes, car, everything

>> No.2372841

okay here is a easy one. you are asked to shoot a projectile over a wall that is 30 meters high and 40 meters away horizontally. what is the minimum velocity necessary to do so?

>> No.2372861
File: 247 KB, 485x600, 485px-Glenn_Seaborg_1964.png [View same] [iqdb] [saucenao] [google]
2372861

>>2372807
Noethers Theorem, and all the Least action stuff (cal of variations). It unites all of physics under one general framework.

>>2372810
Did Condensed matter for years (ferrofluids and other various stuff).

Currently, I am doing Experimental Particle physics at the LHC CMS experiment.

You?

>> No.2372888

could gravity be the strong nuclear force on a macro scale?

>> No.2372893
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2372893

>>2372825
>then why arent we expanding? our bodies, homes, car, everything

Who said you weren't? Imagine I enlarge a pic on my computer. From the perspective of the pic, the pic doesn't change.

As long as the proportians stay the same, the pic views itself as the same.

>> No.2372899

>>2372861
Cool. I did some calibration work on the HF at CMS as an undergrad.

Currently I'm a grad student about to graduate in May. I work on computational astrophysics.

>> No.2372905

>>2372893
So we're expanding without noticing?
How much millimeter/meter/kilomoter, whatever ,each year?

>> No.2372911

I had a question a while ago that I dismissed as retarded, now is my chance!

Lets say I have an oven at 450F with an area of about that of an average oven, A. It is electric, if that matters at all, and at some point I decide to open its door slightly, creating a tent shaped polyhedron (I can't think of a better name for that shape somehow). I keep the door open for 5 seconds: During second 1, the door is opening at a rate R meters / second. During seconds 2-4 it is open and the opening is at its maximum volume (if I can call it that). You can give the shape any reasonable dimensions you want by the way. During second 5 it is being closed at the same rate R.

HOW MUCH HEAT HAS BEEN DIFFUSED?

I would honestly really appreciate an answer to the question. I made it as general as possible, feel free to choose reasonable numbers.

>> No.2372916

>>2372905
Non physicistfag here, that question doesn't make sense, the meter stick is enlarging also.

>> No.2372924
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2372924

>>2372899
Why the switch from particle to astro?

>> No.2372925

>>2372916
oh ... so, nothing is really happening?

>> No.2372926

hmmm
is time the same below the earth as above the earth?

>> No.2372930

>>2372925
Unless there were something capable of observing it, then yeah that's pretty much the way I see it.

>> No.2372948
File: 76 KB, 300x361, 300px-James_Clerk_Maxwell.png [View same] [iqdb] [saucenao] [google]
2372948

>>2372905
If time and space are expanding, so are our ways to measure time and distance.

We could not measure this type of "self-expansion", as we wouldn't have a reference frame.

>> No.2372949

>>2372911
This is a problem of convection and diffusion, actually. And transport problems involving both of these get ridiculously complicated.

I would say the easiest thing to do is have a temperature measurement in your oven,
open for designated amount of time.
Close door, note temperature.
You now have a difference in setpoint and measured temperature. Use this to calculate a heat value (estimate heat capacity of the air).
This heat value/open door area/time gives heat flux while door is open

>> No.2372956

>>2372924
I double majored as undergrad: Astronomy/Astrophysics and Physics. When I went to grad school, I had it in my mind I wanted to do field theory. Then I found that there isn't much funding for such things, and I was a bit put off from particle/fields. I then thought I'd look into the other area I knew, which was astro. Plus I like the computational aspect, solving fluid equations.

>> No.2372982
File: 1.38 MB, 1276x1754, 12-alfred-nobel.jpg [View same] [iqdb] [saucenao] [google]
2372982

>>2372925
Just cause you couldn't measure the "self expansions" doesn't mean you couldn't measure expansion in general.

Local gravity wells will also make it pragmatically hard to measure a "expansion". However, not all space has a local gravity well.
There are entire regions that can explan freely without a local gravity well. And you can masure these.

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

>> No.2372988

>>2372636

How does QM play into microchips, and how do microchips work in general?

>> No.2372994

>>2372988
http://en.wikipedia.org/wiki/Resonant_tunneling_diode
Learned about this in like Physics 3...

>> No.2372998

is gravity the expansion of the universe accelerating in the direction of time?

>> No.2373004

>>2372949

How long would it take to solve it deductively?

>> No.2373012

>>2372994

I know nothing of physics, I want to know more because I came to a revelation of the last year and realized I want to understand the details of nature.

>> No.2373018

>>2372988
Microchips aren't really in the quantum domain generally... The typically quoted number as of late has been 45nm chips isn't it? I think that's the resolution of the photolithography process.

>> No.2373030
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2373030

>>2372911
This is a thread for physics questions in general, not physics hw problems. I won't do calculations for you kid.

This is a fundmentally a continua problem, and could be solved using some Classical Field Theory. Modeling tempeture and heat flow, finding the appropriate lagragian, placing the approperate constraints, ect. (proabably less fundemenal ways to solve it too)

I would suggest this book.

>> No.2373040

>>2373030

I promise you it's not homework, I made it up when I was baking one day because I had no idea how I would do it. I'm not even taking physics, I'd just like to know more about it, and possibly switch my major somewhere down the line.

>> No.2373046

>>2373030

The book recommendation is appreciated though, I'm not quite sure how much I'll understand of it.

>> No.2373049
File: 26 KB, 405x315, 6-dmitri-mendeleev.jpg [View same] [iqdb] [saucenao] [google]
2373049

>>2372988
Quantum Mech comes into play on very small scales. Anything made on a small enough scale will need to use Quantum Mech. Most Modern Tech has some componets that happen to be on this very small scale.

>>2373018
Most modern transistors (in microchips) operate at a scale where Quantum Mech becomes significant.

>> No.2373069

>>2372178

Is economics a science?

>> No.2373073

>>2372524

Null hypothesis. No testable prediction.

Well, that was easy.

>> No.2373075

Physics guy, which mathematics should I study on my own time if I want to pursue something that has to do with particle physics?

>> No.2373087
File: 72 KB, 404x512, 005677.jpg [View same] [iqdb] [saucenao] [google]
2373087

>>2373040
Ohh, well I'm not sure if I can explain more about it without doing actual calculations. But I''l try.

Basically, you make some continous equations (waves) for heat/temp. These have constraints, ie, you know how hot the heating element is or the temp of the inside surfaces, etc. These constraints will actually fix the whole temp/heat functions for the volume.

You can then modifity this with application of an "hole" where heat can escape. You can vary the hole in space and time (closing/opening), calulcate how it effects your teampture and heat equations, and then find your new tempture and heat equations.

It is kinda analoagous to the regular heat equation methodology in physics.

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

Or really basically any potential theory

>> No.2373099

>>2372570

I suppose when you have investment capital but don't understand the underlying physics yourself, making reserved bets like that is the only sensible way you can approach it.

>> No.2373102

Could you describe what, exactly, magnetic flux IS? I mean, I remember that it is like the change in magnetic field over an area or something, but what ISSSS it?

>> No.2373113

>>2373087
What it comes down to is a computational fluid dynamics problem. There is no simple answer.

>> No.2373119
File: 99 KB, 600x738, david-hilbert.jpg [View same] [iqdb] [saucenao] [google]
2373119

>>2373075
Group Theory, Calculus of Variations, Linear Algebra, just to name a few.

Of couse, you need the shitty lower level engineerg math as well. But anyone can learn Cal's, Difff eq, etc.

>> No.2373129

>>2373119
Thank you.

Could you possibly share any others that you think are essential? If it's not too long of a list, of course.

>> No.2373136

>>2373099
Extrodinary claim made by non-scientists.
Most of the scientific community has already dismissed it as total bullshit. You decide know more then the majority of scientist and invest your money. You become poor.

Nice logic bro.

>> No.2373146
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2373146

>>2372988

Quantum electron tunneling is a principle of quantum mechanics frequently employed in microelectronics.

For instance, every single flash memory device in existence depends on electron tunneling to function at all. Each memory cell in a flash chip is a quantum electron trap and could not function if quantum tunneling were not understood.

>> No.2373150

>>2372526
>if in this time your product proves to be, lets say, less than promised, I would demand a full refund, which we would cover in our agreement prior to purchase.

Nope. You would demand a refund only under certain conditions. If you broke even on consumer surplus at the time of the purchase and the product fails then you will demand a refund, but chances are you had a consumer surplus of something greater than zero. This means that the product's failure value would have to be greater than your initial surplus for you to demand a refund. And why would you purchase an undiversifiable investment knowing that the risk is relatively high? That is irrational. Do not stimulate a company with uncertainty attached to it, that can create bubbles and worse.

>> No.2373160

Hmm...question about entropy (I know very little about thermodynamics, so bear with me).

What is the highest state of entropy? I mean, if entropy always increases, is there a cap on how much it can increase? Can a single hydrogen atom become disordered?

I'm having trouble getting my idea across clearly, mostly because I'm just not sure how to word exactly what my question is...if this is too vague feel free to pass over this question.

Thanks.

>> No.2373176
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2373176

>>2373129
The distinction between the math and physics becomes fuzzy. I could have a purley mathematical model, taught as a physics course. Most of the math you need will just be from these types of courses.

Field theory (in physics) for example is a generic mathematical framework, that doesn't acually assume anything physical as its tenets. It could be taught stricly as math. However, since it works so well in physics, it is taught as physics.

>> No.2373183

>>2372303
The acid where it's dissolved in will warm up a little.

>> No.2373186
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2373186

>>2373160
>entropy

Entropy comes from stat mech. This is not fundemenal physics, it does not apply to all scales. Stat mech only works for certian "large groups" of objects in certian types of configurations.

Talking about entropy and single (or very few) atoms together, makes no sense at all.

>> No.2373193
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2373193

Gotta go /sci/. Thanks for the good questions.
I may come back later or tomarrow.

>> No.2373201

what will happen if a set of powerful magnets are facing eachother with opposite ends facing one another but on each magnet there is the same thing behind them making a contiunious line of magnets pushing. every magnet has the same amount of power and the loop circles the earth

>> No.2373202

>>2372178
how do i shot web

>> No.2373258

post a beam with loads on them that doesn't have any shear stress, without it being an axial load.

>> No.2373276

Is it possible to smash waves into a body to create its first harmonic frequency (or any higher overtone) and blow it to shit?

>> No.2374732

how forcefull are farts.

>> No.2374774

>>2372178
If the universe in it's entirety was a hole in a large (infinite) block of matter (like the inverse of a marble in space) could Dark energy simply be gravity of the outer universe (infinite matter)
>?

>> No.2374792

>>2374774
There's no gravitational force inside a hollow shell.
> Edit: Or rather, the gravitational forces cancel each other out, so there is no net force

>> No.2374813

>>2372265
Science does not attempt to answer why, only how.

>>2372411
Here's the answer to how.

Why, we may never know.

>> No.2374814

chemistryfag here, question:

why do up/down spin electrons pair up?
ie is the the opposite spin that overcomes the repulsion of the negative-negative? (if yes - how?)

>> No.2374827

Frequency. Is there ceil and a floor in the frequency a radiation can reach? Can its wave reach infinite or null lenght?

>> No.2374854

When did the first two major forces split up in the fonding of the universe?

And what is conserved in the electroweak force? So hard with this physics