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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
1 46,034
I'm having trouble understanding the idea of escape velocity. How can an object escape the gravity of a massive object...
Feb13-14 03:54 PM
22 765
I am reviewing the first chapter of my classical mechanics book (Fetter & Walecka), and in the very first section he...
Feb13-14 04:09 PM
6 387
hey pf! so when deriving navier stokes we have, from newton's second law, \sum \vec{F} = m\frac{d \vec{V}}{dt} when...
Feb11-14 02:27 AM
17 524
I'm trying to build up some intuition with Gauss's law, calculating the flux through surfaces given certain charge...
Feb13-14 09:44 AM
2 309
The velocity of any point P of a rigid body in rotation plus translation is \vec{}vp=\vec{}vCOM+\vec{}vp,COM. Now...
Feb10-14 04:10 PM
5 299
Hi, this is my first post on this forum, although ive often refered to many posts for random information, so thanks to...
Feb15-14 12:05 PM
6 294
Why entropy is highest at lowest energy? Entropy is disorderness.So low energy means low disorderness.But why it is...
Feb12-14 08:28 PM
16 440
Suppose you have an electron moving at constant velocity. This new area that it is moving into initially had 0...
Feb10-14 05:29 PM
1 260
Why is angular momentum conserved around the bottom left corner in the following set up (see attachment)? The...
Feb11-14 03:34 PM
2 215
hi, recently i notice that there is a dark border around all the streetlight at night. what is this phenomenon...
Feb11-14 05:55 AM
Simon Bridge
2 197
1)What is the difference between standing waves,beats and normal interference of any 2 waves ? 2)Is beats in sound...
Feb12-14 12:33 PM
6 369
Hi Is this formula all i need for finding the speed i need to tip the trolley?...
Feb15-14 08:55 AM
26 572
if a rigid body, lets say a disk,is floating in space and we exert a force outside its center of mass will it rotate...
Feb11-14 09:25 AM
2 255
Let say we have charged conductor M and we know its potential energy function Vm(r) when M is isolated from any...
Feb12-14 07:44 AM
6 263
Hello there, I was taught: a = {v^2 \over R}. I substitute v for the speed of the rotating earth at the equator,...
Feb11-14 02:37 PM
3 309
In kinetic theory a liquid is viewed as an incompressible substance in which the atoms are free to move. I would like...
Feb15-14 01:12 PM
1 234
Hi all I was just wondering if anyone could help me with estimating error caused by misalignment of an optical...
Feb13-14 08:23 PM
Andy Resnick
2 200
I've read that if you want light to diffract through a single slit, the slit opening must be equal too or less than...
Feb13-14 11:24 AM
3 226
Hello - I'm having a difficult time finding this answer anywhere else on Physics Forums. I'm curious if anyone knows,...
Feb14-14 03:48 PM
6 294
Hi! I just wonder what's the actual use for p=nkT≈nE_k when it comes to plasma physics? What does p help us...
Feb16-14 12:05 PM
6 322
For a damped mechanical oscillator, the energy of the system is given by $$E = \frac{1}{2}m \dot{x}^2 + \frac{1}{2}k...
Feb13-14 10:09 PM
2 278
To preface my question, I know it is related to the Gibbs paradox, but I've read the wikipedia page on it and am still...
Feb16-14 01:08 AM
1 203
The standard equation for the damped angular frequency of a normal damped mass-spring system is ω_{d} =...
Feb16-14 04:03 AM
5 368
Searching through Wikipedia (, I found this graph about resonance. I...
Feb14-14 03:05 AM
1 163
I read that for a rotating body the kinetic energy ##E_k = \sum \frac{1}{2}mv^2 = \frac{1}{2}{\omega}^2∑mr^2 =...
Feb14-14 07:47 AM
3 192
One question. In the text author calculate ...
Feb14-14 11:23 AM
2 299
Would a particle kept in the path of an electromagnetic wave experience a force? Both magnetic and electric field are...
Feb16-14 10:47 PM
5 240
why should we use a convex lens to focus the rays at the point on the screen.why is at an angle instead of being...
Feb16-14 04:39 PM
Philip Wood
8 296
The total energy of the magnetic field in the matter is \frac{\mu H^2}{2} , I want to calculated the energy that is...
Feb16-14 11:33 AM
3 292
Suppose we have a infinite current sheet of surface density \sigma and apply Ampere’s law to find the magnetic field....
Feb15-14 08:03 AM
1 182
So Rayleigh scattering says that higher wavelengths of light are scattered more than lower ones - but why don't we...
Feb15-14 01:44 PM
2 237
why do the atoms in excited state alone could emit line spectra?can't they emit when they are not in gaseous state? ...
Feb16-14 04:16 PM
1 317
Hello, I was wondering, do the Lee/Kesler correlations apply at the saturation line for vapor/liquid equilibrium? I...
Feb15-14 10:43 PM
0 203
So, I asked myself the question, "why does the earths force of gravity effect us so dramatically on the surface of the...
Feb16-14 04:05 AM
3 223
What will be the degrees of freedom of a ''Connected pair of compasses''?
Feb17-14 12:45 AM
6 255
From what I understand, an atom generates an electromagnetic field which exerts energy on objects and this...
Feb16-14 10:42 AM
2 225
Suppose you have a sphere (sphere A) with net positive charge 2Q. A conducting spherical shell (sphere B) of inner...
Feb16-14 02:39 PM
2 226
I am studying Laplace's equation in my electrodynamics course (using griffiths intro to electrodynamics). I am...
Feb16-14 10:56 AM
3 241
I've been having a problem with the sign of potential. Electric potential as I know it is defined as V =...
Feb17-14 05:57 AM
Philip Wood
7 305
Say, i have two concentric shells,each carrying a different charge.If i connect an ideal, resistance less wire between...
Feb17-14 04:27 PM
10 404

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