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Classical Physics

- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people...
Apr22-11 05:26 AM
ZapperZ
1 45,612
can anyone proove "kelvin plank" statement of second law of thermodynamics or atleast show that it is always followed...
Dec31-07 07:47 AM
sadhu
4 3,268
Hi all, I'm posting here because I see an apparent paradox between what intuition and equations tell me. I'm sure...
Dec31-07 02:11 AM
animalcroc
7 2,526
Hello, I was recently browsing through on of my physics books, and I came upon the following statement: "Newton was...
Dec30-07 06:19 PM
Integral
2 1,884
So.. we've got a 2D crystal, corresponding an infinite square net with +-e0 charges in each one (see the atached...
Dec30-07 04:40 AM
Istvan
2 3,245
why is there a factor of -1/4 in front of the two tensors? Is it formulated that way for convenience?
Dec29-07 11:29 PM
Parlyne
1 3,844
According to Noether's Theorem, for every symmetry of the Lagrangian there is a corresponding conservation law. For...
Dec28-07 10:58 PM
Rainbow Child
1 1,931
Can anyone tell me where the 4*pi comes from in coulomb's law? I know the law is often compared to netwon's law of...
Dec28-07 07:04 PM
rbj
7 9,092
Hi I need to prove Maxwell's second equation \nabla\bulletB=0 I tried few things, but never came with result... and...
Dec28-07 06:23 PM
ZapperZ
14 3,541
a problem.....pls check.. imagine theres a horizontal planeA bove which the effects of gravity are not felt. any...
Dec27-07 01:19 PM
Himanshu
50 8,966
Hi folks, I have a problem that I am trying to figure out that I hope you can help me with. I don't want to be spoon...
Dec26-07 10:28 PM
shiftless
4 1,734
Hello, is it possible to figure out how much force in newtons is created when a compressed gas expands?
Dec26-07 03:55 PM
russ_watters
6 7,076
we know that during inelastic collision momentum remain conserved but kinetic energy of system does not some part of ...
Dec26-07 03:19 PM
Shooting Star
12 2,417
do gravitational field lines always need to be straight, cant they be just curves if yes then please tell an...
Dec26-07 12:56 PM
sadhu
2 1,635
What does the term "Action" means in physics?
Dec26-07 12:04 PM
belliott4488
9 1,993
how does a transformer work?
Dec26-07 01:00 AM
rbj
5 3,916
Does anyone know of an experiment that shows that the electrostatic and/or magnetostatic forces have a finite speed,...
Dec26-07 12:46 AM
rbj
2 1,768
When they say K=1/2mv^2 does K mean the change of kinetic energy? because Wtotal= the change of kinetic energy...
Dec25-07 10:59 PM
sadhu
2 1,768
hello all, i've been researching a bit of info on lens optics (image propagation mostly), but have only found...
Dec25-07 08:27 PM
infamous_Q
0 1,982
Hi all, I was giving a class on dilatation and I have proposed to the students a problem where two pieces of wire...
Dec25-07 06:16 PM
DaTario
30 3,503
-------------------------------------------------------------------------------- is it true that when the net force...
Dec25-07 01:54 PM
Shooting Star
2 1,832
I want to find a solid argument why entropy always increases and even more important why it is S=\sum_i p_i \ln p_i...
Dec25-07 08:09 AM
Gerenuk
0 1,795
The Ampere's Law is \nabla \times B = \mu J and Gauss's Law is \nabla \cdot E = \frac{1}{\epsilon} \rho Since J...
Dec24-07 06:17 PM
G01
5 2,219
Hi! I am new user to this forums and on the start I have one question: "If I increase the speed of the electrons,...
Dec24-07 08:16 AM
Physicsissuef
2 2,590
Hello experts, I hope you can help me with the following problem. There is one huge pipe (diameter about 3 meters)....
Dec23-07 04:30 PM
LURCH
7 1,236
Hi all, I'm a bit confused about ferromagnetism (and I've come to realize that I'm not the only one)! I'm currently...
Dec22-07 08:51 PM
marcusl
1 2,545
I am trying to figure out a problem. When hydrogen and nitrogen are mixed, the entropy of the gas tends to mix them...
Dec21-07 09:43 AM
lilrex
7 1,376
if there is a decrease in pressure at constant temperature will there be an increase in entropy?
Dec20-07 04:31 PM
Andrew Mason
7 5,635
Hi there. I'm having a problem explaining the physical meaning of the symbols in the equation for an underdamped...
Dec19-07 10:06 PM
Cyrus
4 1,708
Hey Guys, I know that this has been posted before, but mine is slightly different. Our instructor only provides:...
Dec19-07 08:16 PM
pervect
6 13,155
Can entropy change be zero for a closed system in an irreversible process? If yes under what conditions? Thanks!
Dec19-07 12:02 PM
Shooting Star
2 8,881
Why do all rays coming from far off distance from a source(may be planar)... converging at a point need to travel the...
Dec18-07 12:56 AM
pardesi
4 1,058
I am reading Introduction to Mechanics by Kleppner and Kolenkow. I am now reading the articles dealing with...
Dec17-07 11:27 AM
arildno
5 2,827
Please see this link first: http://en.wikipedia.org/wiki/Precession#Classical_.28Newtonian.29 How do they get to...
Dec16-07 06:27 PM
JolleJ
10 4,263
having problems trying to understand and derive the equation for intensity in the double-slit interference pattern. ...
Dec16-07 05:28 AM
St_LightStorm
42 4,444
My teacher asked us too prove that Hamiltons principle proves that newtons equations of motion hold for N particles....
Dec16-07 12:00 AM
frenchyc
4 2,008
Voltage = Current * Resistance Power = Current^2 * Resistance Magnetic field magnitude of a solenoid = magnetic...
Dec15-07 06:39 PM
DaleSpam
5 2,984
I conjecture that only spherical symmetric mass distribution can produce radial gravitational force field (according...
Dec15-07 04:22 PM
mma
11 3,121
Bulb with volume of 5 liters is filled with nitrogen n = 3 molls. The bulb is set in space, the bulb cracks and the...
Dec15-07 12:10 PM
Privalov
25 2,067
In the chapter on radiation (Chapter 11), Griffiths notes that an electric monopole does not radiate, but also that a...
Dec15-07 06:14 AM
Shooting Star
1 1,158
Hi all, If we take the integral of tau (the resultant torque) times the angular displacement theta, with respect to...
Dec14-07 09:17 PM
Shooting Star
18 2,524

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