/sci/ - Science & Math

how do magnets work?

can you help me out with a gravitational physics rocket problem?

How high does a rocket go if v=3,1 km/s? Ignore air resistance and the Earth's rotation. Apply law of conservation of energy
RE= 6.37 x 10 6 m , ME = 5.97 x 10 24 kg, G = 6.67 X 10 -11 Nm2/ kg2

what would happen if you put a black hole into a black hole?

>>2209829
dat is so eezy, figure it out own your own

>>2209841

>>2209825
photons

>>2209829
I need more info about your problem!
what is the thrust of the rocket? Does it have thrust? Is it shedding mass? is it just in freefall? is that velocity you gave, the initial velocity?

would the first black hole suck in the second black hole, or would the second black hole suck in the first black hole?

>>2209839
>>2209851
More info is needed to solve your problem.

>>2209851

a bit like this:

>>2209850
no thrust, no air resistance, no shedding mass it's a single rocket, just a rocket launched vertically from earth's surface with initial velocity =3,1 km/h
the rocket's high should be calculated compared to earth's surface

>>2209864
Dammit! Don't turn this into an engineering thread!

Suppose you have something that resembles one of those sprinklers that you put on the end of a hose and it rotates in a certain direction while releasing water, except this device sucks IN water. If this were to be put on the bottom of a lake, in which direction would it spin?

>>2209881

By which I mean, would it rotate in the same or opposite direction as its sprinkler equivalent.

>>2209872
Lol, then you don't need all those constants you gave. Just say KE = PE
=>
m*v^2/2 = m*g*h
then solve for h (all you need is v, which you have, and g which is 9.8)

anything else?

Explain exactly what entropy is and how we can prove it exists everywhere.

>>2209890
entropy is like the physicist's proof for god

>>2209887
so h=1/2 v^2/2g?

>>2209899
WTF is this nonsense?

>>2209890
Entropy is fundementally a measure of accessibility to quantum states.

>prove it exists everywhere

Every system has quantum states, hence you could define a measure called "entropy" for any system.

>>2209901
I'm not helping you with your algebra. You should be able to do that shit on your own.

can you disprove the existence of a God (or Gods) using the power of physics?

>>2209916
you meanie Albert.

just look at all the people around you here. you're just a small time.

>>2209918

You don't need physics to disprove the existance of god/gods. All you need is basic logic to prove the "belief in god/gods" is a flawed belief.

But thats neither here or there, this thread is for physics questions. Not fairtales.

>>2209850
you call yourselves physics guy... and then you try to tell me magnets work because of photons....
get your act together

>>2209932
If we leave Christianity and its ridiculous contradictory ideas aside, could you still disprove the existence of all things supernatural/divine/spiritual? Belief in god/gods might be a flawed belief, but the total belief that nothing "supernatural" at all can exist is also a flawed belief

>>2209924
lol look, there is a woman in the photo

I Am God

Cherio Physics Guy, the real human has arrived.

>>2209924

Just out of curiosity, does anyone else think Schroedinger looks like a time traveler in that picture? I can't explain this observation, but I think it every time I see it.

>>2209823
I'm not interested in following the curriculum set ahead for me, so what would you suggest I take to reading? I've got a list of books set aside for the winter break, but I'm always game for more experienced words.

Ok, this is one that I saw in my physics class today, and I know the answer, but it's kind of an interesting problem so I figured I'd post it here.

There are two metal spheres, exactly identical in every way - volume, composition, specific heat, etc. One is hanging at rest from a thermally insulated string and the other is at rest on a thermally insulated table. An equivalent amount of heat energy is then added to both spheres. Which sphere is at a higher temperature after the heat is added?

>>2209955
Magnets work, because of photons. It is not my fucking fault you don't like the answer, or it doens't make sense to you.

If you phrase your question in a more specific manner I can elaborate, otherwise you can fuck off.

>>2209952
>could you still disprove the existence of all things supernatural/divine/spiritual?

You can prove that to "believe in that nonsense" is a flawed belief.

>the total belief that nothing "supernatural" at all can exist is also a flawed belief

Wrong
Look, if you are really interested in that meaningless shit, you need to take a basic college level logic course or phil course. You will then be shown step by step, how fucking stupid you sound and why such beliefs are nonsense.

I am not debating trivial shit (the belief in imaginary friends) with you. Educate yourself.

>>2209983
AETHER IS A FAGGOTY ALWAYS!

>>2209993
Which branch of physics would you say has the most need for creative minds exploring? Pay is pretty asinine.

>>2209985
What are you intested in?

>>2210001
Signed up for Astrophysics right now. Interested in particle physics and quantum physics and the philosophy that's projecting everyone towards all the field theories. I'm a greedy bastard. You tell me there's a good read out there, I'll pick it up.

>>2209999
You mean what area of physics is the most "creative"? Needs the more creative minds?

Theortical Particle physics. Theory in general usually requires alot of creativity. Particle physics requires a great level of abstraction.

>>2209993
Why don't you educate me? You must have took a basic level logic course after all. Although you can't explain magnets, so I can understand why you're having difficulty explaining the lack of existence of the "supernatural" to me.

>>2210004
It depends on how much you can handle (what level you are at).

Do you know Lagragian and Hamiltonian dynamics yet?

>>2210007
This is a science board, no religion (fairytales) allowed.

If you really want me to explain that shit to you, then make a thread on /b/, and give me the link, AND I WILL SCHOOL YOUR ASS THERE!

Else fuck off Troll

>>2210007

>>2210006
Nice. I'm samefagging a little here,
>>2210004
>>2209985
but yeah, my plan was to sign up for astrophysics considering it has [what seems like] a wider range of different places I could drop into.

>>2210008
I don't know if you saw the thread the other day, but I requested a few titles to learn lagrangian and hamiltonian mechanics. Pic related.
I'm pretty fucking serious about pursuing this. Math is np, but memory tends to be a little shit. I can generally build up to something from the ground up easily enough.

There's a wheel rotating in space fast enough that the outer rim is traveling at or near the speed of light.
Suddenly, the spokes extend, far enough so that the end of the spokes are traveling faster than the speed of light through space.
Is this possible, and if it is, what happen?

>So, anyone got any questions?
Please explain electromagnetism.

Why is electric force so much stronger and why does it act on such short distances?
What is magnetic conductivity? How does the magnetic field get conducted?
If the electric field propagates in all directions in 3 dimensional space, how can we say that it creates magnetic field that is perpendicular to it (which too propagates the same way) and thus explain light polarization?

>>2210021
Yeah, well you need to have a good grasp of the basics (Lagragian and Hamiltonian Mech), in order to understand the more advanced shit.

>I'm not interested in following the curriculum set ahead for me

Why? Most physics curriculms are all the same. You need that baby shit to understand the more advanced shit. If you try and skip ahead you will not get very far, and just end up wasting a great deal of your time. But learn the hard way....for all I care.

You need basic mech, before you can really understand quantum mech. So I suggest you just read Marrion and Thorton. It may seem boring as fuck, but all those conceptS in there are needed for more advanced physics.

>>2210044
Inclined to say that the curriculum is slow and seems spotty at times. This is why I'm looking for outside resources. Wouldn't you say getting a handle on the adv mechanics make classes easier? Fuck, I got nothing else to do over winter break but run and read.

>>2210044
Got any stories to share? something exciting or fun you've done over the course of learning physics.

>>2210031

>Why is electric force so much stronger

stonger then what?
In any case, its "strength" is due to the properties of the photon. You really need to have some knowledge of particle physics, if you want a more detailed answer from me.

>and why does it act on such short distances?

EM, actually works on unlimited distances, but it is an inverse square law, hence it just gets smaller and smaller, but it is stll there. You need a basic understanding of lagraginan mech and poteinatl theory for any futher explaination.

>What is magnetic conductivity?

This is really not a term that is used

>How does the magnetic field get conducted?

No idea what you are talking about.
Again, the magnettic field is really just photons. If you see a magnetic field, you are just seeing photons interacting with shit, nothing more.

>If the electric field propagates in all directions in 3d space, how can we say that it creates magnetic field that is perpendicular to it.....blah blah blah

The magnetic field is the relativistic effect of the electric field. They are really the same fucking field. It gets all these "werid properties" due to special relativity. So you need to know special relativity for more info.

Why would you regard photons as an explanation for electromagnetic fields when you can just as easily regard electromagnetic fields as an explanation for photons?

>>2210064
It is great to have ambition, It will get you far....
but still.

Advanced mech?
What do you mean by adavanced mech? Lagragian / Hamiltonian dynamics? Qunatum Mech? Classical Field theory (CFT)? Quantum Field theory (QFT)? Group Theory/ Calculus of variations?

There are different levels of "advanced", but that all draws on previous knowledge. Ie, you won't get QFT unless you know CFT, and you wont get CFT unless you know Lagragian/Ham Mech.
Makes sense?

It would like be trying to Learn Cal 1, when you don't even know basic fucking algebra. It just won't work. Make sense?

>>2210103
Of course, but that's what you're answering for me :3
While everyone is asking direct questions pertaining to certain phenomena, I'm asking for the books that will allow me to understand more than just that. I'd figure you could appeal to that more than the other nutgrabbers.

>>2210092
Lol.....nice thinking. But your answer lies in some pretty adavanced Quantum Field theory.

Let just say is well known, that the "photon field" is the more fundemental object then the simple field (EM) you think about. In fact there end up beign a shit ton of more fundemental fields that eventually lead to what you know as the EM field.

The actually particles themselves are usually just thought of as excitations in more fundemental fields, field much more fundemental then the shitty EM field....lol.

>>2210081
Ok, let me rephrase then.
>Why is electric force so much stronger than the magnetic force?
>And they are virtual photons but they explain the electric interactions.

>and why does it act on such short distances? (the electric field compared to the magnetic)

>What is magnetic permeability? How does it work?

>The magnetic field is the relativistic effect of the electric field. They are really the same fucking field. It gets all these "werid properties" due to special relativity. So you need to know special relativity for more info.
How is that? How is the magnetic field the relativistic effect of the electric field? I know pretty well special and general relativity but I just don't get what you're talking about.

>>2210112

Ok, sorry, I guess I got off point.
Yeah, by far the most fundemental tools you need to start off with in physics, are Lagragian and Hamiltionan Mech.

These will give you the ability to simplify physical systems, by generalizing ideas like mometum or energy, etc. You will eventually be able to create your own versions of mometum, position, energy, times...as you see fit, however the fuck you want. Ie, mometum becomes "momenta".

You should eventually be able to realize that it isnt the "defintions" that matter, but the way the concepts relate to one another. It will give you a great ability to abstract physics, in a way you may not have thought possible before.

If you never learn how to do that, you will not make it to anything more advanced. I reccommend Marion and Thorton. Good luck!

Why does gravity have to be such a hipster? Why can't it be more like the other fundamental forces?

>>2209823
Can you explain me the vacuum fluctuation thing and it can be really thought as "something comes from nothing"?
(sorry for not proper language)

>>2210139
You have been invaluable. Thank you.

>>2210146
not OP
it's not something out of nothing
it's borrowing energy from ahead or back in time

something like entropy gone time-wide

>>2210120
The quantum field of which photons are excitations is called the electromagnetic field. But you are right to point out that it's a much more complicated thing than the classical EM field. We just call it by the same name for the same reason we don't start calling electrons "wavelectrons" or some nonsense like that when we apply quantum mechanics to them instead of classical. That said, it's arguably easier to explain how magnets work by explaining the classical EM field directly from the properties of the quantum EM field than it is to use virtual photons as an intermediate step.

>>2210134
Lol.....the forces (E and M) are the same strength, it is all a matter of perspective, and how you set up your system.

It is pretty obvious that you need to study a little more special relaitivity, if you dont even know how to apply that shit to fields, but you seem to be on the right track though.

Do you remember how that the magnetic field is only created with moving charge? Never wonder why? And since motion is relative, what would happen if I was moving with the electron, then there would be no magnetic field!....wtf?...Yeah, that turns out to be correct, the Electric and magnetic field are not some "set fields in space", they are in fact "frame dependent".

We usually see magnetic fields, because the electrons are usaully moving (leading to relativistic effects), but if you stop the electron the magnetic fields will all dissapear!

All that shit is explained in basic EM, or Classical Field theory. pic related

Magnetic permability is just a product of the medium the magnetic field is propagating in, again since the magnetic field is just the relativtisc effect of the em field, it can be directly related to the electric permability, and visa versa. Which is in turn directly related to the speed of light. Hence there is only one fundemental property of the medium (the speed of light (the photon)), you can the find the electric and magentic permability from it, and the way you set up your system.

Make sense? anything else?

>>2210146

>can be really thought as "something comes from nothing"?

Yes.
However, just becuase somthing can come from nothing doesn't mean we cant use physics, math, or science. There are in fact very percise ways that "somthing can come form nothing". There are very very specific rules, that must be satisifed!...etc

What are your qualifications and interests in the field of physics?


Third year physics undergrad here.

>>2210226
BS Physics
BS Mathematics
Have worked at a few National Labs in the US as an undergrad, a few REU's as well

MS Physics Condensed mattter

Phd (working on) Experimental Partcile Pysics
currently working at the LHC

>>2210185
Thanks now it makes more sense.

I would like help on the rocket equation, I think my book has it wrong

dM/M shouldn't it be negative, since the mass is decreasing? If so, how come it all seems correct?
Please explain what happens in the last 2 equations

Pic related

hey op if you're still there, check out >>2210241 please

>>2210270
>dM/M shouldn't it be negative

I need more info on the system in question.
However, M is positive, so it depends on how you define dM, so how it it defined here?
If it is Initial- Final of the rocket, then it is fine. It if is Final-Initial of the exhaust, it is also fine.

>>2210237

Hey Physics guy, I am just learning for my masters in physics and I fucking missed something.

When exactly did I not pay attention that the weak and the strong force got introduced ? They pretty confuse me as they have not the classical F= whatever , but they only talk of the particle change... but still the strong force has an effect on the movement of an particle as its potential is in the Lennard-Jones Potential.... so what the fuck did I miss ???

>>2210270
Yeah, your right. I didnt even look at the last two lines, you need a negative to get the math they did

>>2210320
did you take an particle physics courses yet?

There was an introductury course last semester but appart from telling :

this is a weak interaction
this is a strong interaction

when classifying particle changes they did not tell more about the concept of it being the 4th force and having a classical impact on particle movement. The course sucked pretty much and I msut say I have not done much reading on my own till now, just working it out in books and they too don't mention more expkanation other than confusing me with their classification of strong or weak interactions

Is there any case of 3D rigid body motion for which the equations of motion with Euler angles are integrable in closed form (not numerically)

>>2210302
m is the exhausted mass(consisting of propellant). Its given by dM/dt(the mass decrease over time)

v(e) is the velocity of the exhaust(which is a constant)

>>2210342
do you have to do a lot of programming in your LHC job?
if so, what do you primarily use?

If Ice is denser than Water, why does it floats instead of sinking?

>>2210360
>concept of it being the 4th force

WTF do you mean? The weak and strong are seperate forces. The 4 forces are grav, EM, weak, strong. You probably need more particle physics, or some QFT before they tell you any more about that shit. Did you not do basic feynman diagrams?

They dont tell you about that stuff in QM, becuase you actually don't give a fuck about where the potential comes from in basic QM.

>>2210391
water is the densest at 4° C, so everything with T above that or below that (e.g. ice) will float in 4° C Water

>>2210368

It should be m_initial above since the more mass you loose the more acceleration you acquire, so v must increase

The correct form is -dM/dt so the minus sign inverts the stuff inside the log

>>2210390
Yes, of course. I use C++, Shell, Basic, and Python just to name a few. All of our computers are scientific Linux

>>2210404
so what language would you recommend learning first?

>>2210396

4th force -> typo, sry, of course I mean being the 3rd and 4th force of the 4 fundamental forces

I just know the basic Feynman diagrams of electrons exchanging photons, would a look into fenyman diagrams give me more insight for understanding or will this not help that much either as I am lacking something else to understand ?

>>2210410
Probably not, dont worry about it for now.
When/if you take Quantum field theory they will explain all that shit then.

>>2210409
Learn Visual basic, then Visual C++, then everything else should be easy from there.

>>2210402
no v(e) is not the acceleration, its the exhaust speed of the propellant. This is a constant, the exhaust gas is always going at e.g. 11,000m/s no matter what.

>>2209983
thread ended here

>>2210541

ans the rate of change of said velocity is the acceleration

>>2210210

Still here, Physics Guy?

I am still having problems conceptualizing "something from nothing."

Please explain to me, why you on electronic level can convert mass into energi, and energi into mass with the E = MC^2..

That and why e^2 differentiated gives e^2

If you're still here, could you take a peek in this thread: >>2210853 and answer the question about what these circles are?

Oh, if the physics guy still is here, maybe he can help me with this little problem:
If you shoot a beam of neutrinos at an energy ~10 GeV towards a detector 730 km away, and have a near detector 1 km away, which values of massdifferences in neutrinomasses could one not get an experimental signal from, because the amount of oscillations coincides in the two detectors? Should one be looking for typical oscillation lengths or what?

Let's get to some real physics

What are your thoughts on the fundamental universe merely following the laws of information entropy?

>>2210944
ahem,
e^2 differentiates to 0.
e^x differentiates to e^x.

>>2210924
... me too. Damned bibles. Meanwhile, back to science, can Physics Guy tell us more about the way our universe actually formed?

g

>>2210924
>having problems conceptualizing "something from nothing."

wtf do you assume that you should be able to conceptualize shit? I dont understand your reasoning.

>>2212706
hey physics guy

is it electrostatic forces or exclusion principle that stops me walking through the wall?

Ah! I have a question that I hope you can help me understand.
I have a gyroscope, with angular moment M.
It has an angular velocity v.
I apply an angular force (torque) to it, T.
It spins, and I get that.
but when v gets smaller and smaller, the rate of rotation increases.
so the angular moment of the gyroscope on the other axis (on edge axis?) increases.
when v is very close to zero, this behaves erratically/doesn't work.
What happens as v approaches 0, and what are the equations governing the motion of the gyroscope?

>>2212714
The electrostatic force

Since I slept through the majority of my primary education, where can I go to brush up on the basics of physics? Is there a good site out there for someone like me, or a good book I can check out? I just hate the idea of being utterly ignorant of something so important.

>>2212743
On a follow up, it is only becuase the exclsiuon princple applys to the total of the quantum states. Hence, I could actually have particles existsing at the same fucking spaces, even if they are fermions, as long as they have differnet energies.

Otherwise, it would be corrent to atribute your inability to walk through a wall to the pauli principle (assumeing you are mostly fermonic matter)

>>2212727
I can't follow you, how are you setting up your system? It only is rotating in 1-D? 2-D? 3-D?
(I dont use gyroscopes much)

>>2212759
It depends what you want to know? If you just wanna do some "pop-physics" there are plenty of books at your local barnes and nobel. If you want to do real physics, that is another story. So what do you want?

>>2212759

Khan Academy

>>2212786
I want a serious introduction. I'm confident in my calculus, so I'd like something more substantial than pop-physics, though my goal is simply to improve my understanding of the basics.

>>2212776
For simplicity, a hoop rotating in the xy plane.
vector for angular momentum can be zhat
torque can be yhat
so the progression will be in xhat, with magnitude torque/angular momentum
since angular momentum is just angular velocity times moment, and torque and moment are assumed to be constant, then the progression has magnitude k/angular velocity.
so we have a /0 issue.
I got this much from wikipedia, I was wondering if you can help me with this last part.

>>2212798
I actually here good things from that Khan shit (although I have never been there)

>>2212796

I would just suggest you go to your local university, and buy the intro physics book for cal based physics, the 101 class. It will usually be some huge ass, expensive book, but it will cover a great amount of the basics. Usually at least two semseters worth.

There is actually a torrent called "physics complete" that has tons of books in it. Many very very advanced textbooks, as well as more basic intro textbooks (and a few popsci books)

>>2212819
sigh. I'm not at uni, I'm at home. I took the first three lower div courses, and none of them covered gyroscopes. (kinematics, gasses, e&m)

If you can't help me, I'll dig through project rhysome for a book....

>>2212811
still not getting you. I need to see it, do you have a pic? is it the "Precession on a gyroscope" pic on the wiki?

If so you just have a simnnging top problem and you can use Eulers equations of motion.

>>2212843
I'll draw one, gimme a sec.

>>2212743
dyson proved it was exclusion principle that kept solids solid, so to speak

>>2212830

http://en.wikipedia.org/wiki/Euler's_equations_(rigid_body_dynamics)

These kinda of equations work for all sorts of objects rotations in 1-3 dimensions (mutiple directions of rotation). There application is covered very throughly in a book called "Therotical mechnaincs of Particles and the Continua" by Fetter, it is a grad level book though.

You can get all sorts of werid motions with systems like this, but they still obey equations that can be solved easily (at least numerically).

i'm interested in what happens to C_p as M goes to zero (due to angular velocity going to zero)

C_p is an angular velocity, and the gyroscope has a moment about that axis of rotation, so there will be some angular momentum in that direction as well.

I gotta go do stuff IRL, I'll be back online in about 40 min.

>>2212854
LOL.....
maybe so, but that isnt what was asked.
It seems like you are generalizing way way too much as well.

If you showed this "paper" of his, I doubt it means what you think it means. But feel free to try and correct me, bring it on son...! I am waiting to see your "evidence".

Why doesn't light go through my hand but other wavelengths do?

>>2212908
Light does go through your hand. Go into a perfectly dark room, and put up a strong light to your hand. It will shine through (unless maybe you are really really fat or sick). The light coming out with be redish though.

What are the postulate's on which modern physics is based?

What's with the standard model these days? I thought the electromagnetic and weak forces were unified already? And it doesn't include gravity? Doesn't that make it wrong?

df

What role do our other senses (aside from sight) have in collapsing the wave function? Do they still count as an observation?

>>2209829
potential=kinetic
GmM/r=(1/2)mv^2
solve for r and plug in values

>>2212939
They are not really unified actually, i mean the frame work is there, but we are still a couple of steps away from that shit. (More shit we need to find experimentailly to validate that model). Even if we do manage to unifiy them, then we still need to incorpertate the strong force in there, again, there are models, but not enough experiments to back them up yet.

Then yeah, there is no gravity. The model is incomplete, but it is still the most accurate model ever made so far. Hence we use it!
A model is not wrong, in that it works for what it is used for......DURRR. You need to read up on the "range of validity".

>>2212941
Any form of Interaction is "observation" and collapses the wave function. It need not be sight, or any "sense" we have. Make sense?

>>2212941
Not OP but:
any interaction that sharpens one component diffuses the other. if we could "see" quantum effects that would count.
but not the fact that we are there, but that you object has interacted with (in case of sight) photons.

Remeber, your eyes are simply complex photon detectors, and the apparatus we make is simply the same thing but able to discern things we cannot

>>2212974
nicely put

>>2212939
every model is "wrong" on some level, but if we can use it to comprehend or predict what is going on it is useful.
In turns out that in the quantum mechanical reactions we study, gravity plays little to no role.
we consider it incomplete. just like newtonian mechanics is uncomplete without relativity. but still predicts our solar system so closely that it took hundreds of years before proper anomalies that needed corrections were found
(sort of, anomalies were known, but it was still incredibly accurate compared to earlier models)

>>2212930
Most of the advanced physics is based off nothing by symmetery/group theory and Nothers theorm. Although there are a fucking multitude of laws and ideas that all physics draw on.

Just a quick question, again about the gyroscope/moments.
When using Euler's equations, Ix,Iy,Iz are time dependent, or rather, position dependent, so if the hoop ends up on its side, their values can change?
or are they constant, and there is only interplay between torques and angular velocities?

>>2212982
thanks. heard a nice analoge for this by a collegue:
if you stand in a dark room and someone throws one of those bouncing toys on the floor, more or less perpindicular to the ground.
(perfectly elastic and all that, bounces forever)
from earlier experiments we have figured out rougly how quickly it moves throught the room as it bounces from floor to celing.
If we were to model this, we could say something about where it is likely to be (close to the floor or celing for instance), and how far away it "could have come".

Imagine you now feel the ball bounce off your foot.
You now have a measurement of position, but you fuzzed up the movement, and cant say how fast its going or in what direction.

>>2213002
What eulers question are you talking about?

The ones I gave you were a systems of three coupled differntail equations. In these every parameter depends on every other parameter.
Only time and initial conditions are is independent (naturally).

For certian simmple systems, the equations might reduce and decouple, however that is not the general case.

>>2213017
Its a nice analogy, but I try and not put QM in terms of classical Mech, ever.

The problem is that, observable eignevalues values dont actually exists until observed. Its not like the values are there, "in nature" but our measureing systems is flawed. The actual case is that the values dont fucking exist "in nature", we force the values to exist and fit into a form we can comprehend.

It is not the natural state of things though. The idea that a "eigenvalues" of hermitian operators naturally exist in nature is laughable.

But I imagine you know that already.....

>>2213069
i should perhaps have stated that it is not applicable in any real way, but it works for thinking about how it affects each other, i did not intent to imply that the problem with QM was that we had a "strangely shaped shoe"..

what do you study, physics guy?

>>2213087
Working on my Phd in Experimental particle physics, as part of the CMS collaboration at the LHC.

Physics guy is the new king of /sci/

>>2213069

>>...observable eignevalues values dont actually exists until observed...

jeez clownbait... and I'M bettin' on the little light in the 'fridgerator stays on.

if you're not observing it, it could be there.

here's one - light (the phenomenon) completely permutates space; therefore, wherever light is (or ends) is this universe. does light end?

>>2213154
dude. its been shown plenty of times.
and introductory book too QM usually has examples.
(look at the x,y,z spin components in the cat book for instance)

>>2213111
cool, what did you do your thesis on, and what are you working on now?

Well physics guy...congrats.You are a beacon of hope in the huge ocean of trolling and fail that has become /sci/ ( some others are also,i must add.)

if magnetic fields can't do work on particles how come magnets can pick up pieces of metal like nails off a table??

I'm hopping to go study physics next year,(degree level)
my mathematics is up to scratch but I fear my knowledge of chemistry is lacking.
can you recommend any relevant chemistry books I could be reading between now and then

>>2213232
Currently, I am just working on Super-symmetry, trying to figure out some way to merge the Electroweak force with the strong force.

This may change though, we are getting a shit tons of data, and if I find somthing more fruitful I will jump on it. Our data is pretty much free (restricted to our group), so I have all the resouces I could ask for, it is just up to me to figure out something worthwhile.

>>2213251
You really don't need much chemisty (other the the basic 101 and 102) for physics. Unless you plan on doing some kind of condensed matter physics, you should be fine. And even if you do condended matter, you will only need to know a very very specific field part of chemistry, which you will usually be taught by your supervisors or the relavent chemists at your university.

In short, dont worry about chem. Math is way more important to a physicst.

>>2213248
The changing magnetic field created by you moving the magnet induces an electric field. This electric field induces a current in the object which in turn induces a magnetic field that is attracted to the magnet!
The object you just picked up is heated up by the current, btw.

>>2213291
Thanks, that's good to know

>>2213248
It becomes meaningless to think about a "magnetic field" as some entity that exists by itself. >>2210185

The magnetic field in one frame is the electric field in another. And since that is the case, you can just say you have electric fields causing the "force" and "work".

>>2213322
Nicely put, much clearer then the explaination I was trying to write....lol

>>2209823
Ok, well I'm off /sci/
Thanks for the good questions.
I enjoy our conversations, it keeps me sharp.
I'm sure I'll be back sooner or later.

who is awesome? /sci/ is awesome!
Except for Aether, he is a fucking FAGGOT

Why are fat people lazy?

should't they be more energetic since they have more mass, and E=mc2.

>>2213322

how come if you place an magnet and ferromagnetic material close to each other but initially at rest, they ferromagnetic material will be attracted to the magnet?

>>2213371
+1 Respect for motherfucking Doctor Who
-.5 respect for Not David Tennant Doctor
.5 Respect is still pretty good, OP

At the moment I am a chemisty BSc student,
I really want to break more into physics but my math is poor and I have little understanding of physics.
Have you got any suggestions where I should start to read and what I should look into I want to know more about quantum and particle physics as it seems more relevant to chemistry.

Why do boobs make boners? PLEASE STATE IT IN A MATHEMATICAL FORMULA OF SOME SORT>

Hey science guy, I have a question for you. My friend told me that because of physics, it's more difficult to open up a refrigerator door the second time (immediately after the first) than it is to open it up just the first time. And I don't just mean 2 times vs 1, but the second time being literally harder than the first. He wouldn't explain this to me, but I'm curious to know why the is. Please explain?

>>2213562
>>2213562

my textbook Physics for majors (with modern physics)

it's ridiculously expensive but it has EVERYTHING in it... like 5 semesters worth of info

>>2213649


when you open the door the vacuum caused by the door changing position causes air inside the refrigerator to rush out. this means that there is less air in the refrigerator, making it slightly more a vacuum and therefore more well sealed... not nearly a noticeable effect though

>>2213278


my understanding is that it would take a ridiculous amount of energy to unify strong and electroweak forces.. they separated about 10^-30 seconds into the universe's existence when the ambient temperature was about 10^28 kelvin