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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 47,836
Currently I'm reading Magnetostatics. While reading Divergence of B, I fell into a confusion that what divergence...
Aug18-14 08:53 AM
AbhiFromXtraZ
14 305
Hi pf, I have been reading about back EMF and just had a few questions. I found this article on wiki...
Aug18-14 06:21 AM
milesyoung
1 153
if the sun disappears, the earth would go dark and life would end ... it would also go out of orbit but how...
Aug18-14 01:25 AM
haruspex
8 325
Hi guys. Let me just say at the outset that I know very little fluid mechanics but I keep coming back to the same...
Aug17-14 05:19 PM
WannabeNewton
12 361
Maximum value of friction depends upon the normal reaction and normal reaction can be impulsive, so does that imply...
Aug17-14 02:15 PM
WhatIsGravity
2 148
Different four potentials can generate the same electromagnetic fields. Specifically the following degrees of freedom...
Aug17-14 12:04 PM
USeptim
13 309
I've been looking for this proof for months but I wasn't able to find something...
Aug17-14 09:46 AM
Simon Bridge
1 159
It is well known that when the vapor pressure of a substance is bigger than the external pressure, it boils. In vacuum...
Aug17-14 07:19 AM
voko
16 240
I completed the book 'Nonlinear Dynamics and Chaos' by Strogatz. What will be next good book to learn about nonlinear...
Aug16-14 08:01 PM
td21
1 155
How does a water pump in a water cooler work?what are its parts .the picture of the water cooler is given in...
Aug16-14 05:24 PM
sophiecentaur
3 433
All, I need your help, please.....this is true I was rear ended and I would like to know the impact force.... ...
Aug16-14 05:13 PM
sophiecentaur
1 155
I found this picture somewhere: http://i.gyazo.com/2193323b9ce9aa7fbea211d2b61f10fb.png My question being, as in...
Aug16-14 04:42 PM
haruspex
51 1,190
Hello, Itís well know that there are some gauge conditions that permit different potential fields to generate the...
Aug16-14 06:52 AM
USeptim
2 260
Why is a charge from say an electron a scalar. It has a constant magnitude, and it has a direction.
Aug16-14 03:34 AM
Shing Ernst
11 335
How effective are the thermal management techniques in satellites? What kind thermal loads can they support? And I...
Aug16-14 01:46 AM
Drakkith
2 232
I have this expression: f(\tau) = 4 \pi \int \omega ^2 P_2 P(\omega) \, \mathrm{d}w \quad where P_2 is a second...
Aug16-14 12:59 AM
Greg Bernhardt
1 310
Hello, I am new here. I was reading Wangsness electromagnetic fields and he delves into a short discussion about...
Aug15-14 07:14 PM
Greg Bernhardt
1 258
Forgive me if this is in the wrong category. I have a product I am working out - I am a programmer and electronic...
Aug15-14 11:53 AM
jedishrfu
4 172
After being through with Newton's 3rd law of action reaction pairs, there arise a doubt regarding the categorization...
Aug15-14 11:35 AM
swayne221b
6 174
Hi, First of all, this is not my expertise so I'm sorry for things that are noted wrong. I would like to know some...
Aug15-14 11:03 AM
berkeman
5 1,291
I understand that the dynamic modulus of a material is measured by inducing a sinusoidal force and measuring the...
Aug15-14 09:20 AM
Chestermiller
3 199
I have a system described by the hamiltonian H in the coordinates i, p_i . A transformation of the type $Q_i =...
Aug15-14 08:07 AM
newton_1372
4 263
If I have particle moving in the potential ##V(x)##, when I write equation of motion ## \frac{dx}{dt}=-V'(x)+q(t)##...
Aug15-14 03:23 AM
Shyan
7 180
According to Fermat's Principle (modified version) a light ray takes an extremum path. Can anyone explain the physical...
Aug15-14 12:25 AM
Shyan
1 148
It is possible that a fixed point to be attracting but not Liapunov stable. I can't find any example of that.
Aug14-14 08:56 PM
beman
0 136
This is from Wikipedia: 1. What is really meant by "self-propagating", how it works? 2. How many electric...
Aug14-14 06:21 PM
pleco
44 923
Why do we use inertia in rotational motion and not the whole mass of an object ?
Aug14-14 01:24 PM
Pythagorean
3 149
Why is the weight of the liquid displaced = buoyancy force and not the weight of the submerged volume of the object? ...
Aug14-14 01:19 PM
shangriphysics
9 224
Consider a parallel plate capacitor with layers of dielectric between its plates somehow that the interfaces between...
Aug14-14 01:17 PM
Born2bwire
1 131
Hello, On p.573 of Jackson 2nd Ed. (section 12.1), he says, "From the first postulate of special relativity the...
Aug14-14 11:39 AM
HJ Farnsworth
2 192
Suppose I have a sealed container of fixed volume containing 3/4 air and 1/4 of some liquid by volume at room...
Aug14-14 10:43 AM
Larry Shick
4 205
If I understand it correct during hammerthrow an athlete muscles cause Fcentripetal force on a ball and ball cause...
Aug14-14 06:31 AM
rcgldr
11 205
Hi to all. I'm looking for ways heat could be converted directly to electrical energy. I figured out some machinery...
Aug14-14 03:51 AM
inelwk22
15 1,280
I know that if density of an object is equal to density of fluid, the object will be fully submerged hovering right...
Aug13-14 07:33 AM
sophiecentaur
7 191
Entropy gave us that everything can happen, just that the chances of it happening is very slim. If time is infinite,...
Aug12-14 10:16 PM
Simon Bridge
6 382
I have been struggling with the following; (apologies if this is a simple question) After reading the Hershel...
Aug12-14 01:41 PM
mfb
3 185
Hello all, as a recent graduate and a new teacher, I am living in Honduras and teaching the sciences in a high school...
Aug12-14 01:06 PM
Rocky9242
2 200
Quick question. If the EM field vectors are perpendicular to the direction that an EM wave is traveling, how can light...
Aug12-14 12:29 PM
DaleSpam
58 1,383
Hi Folks, Why does a parachutist experience 0g (assuming falling in a vacuum, no drag) when falling towards the...
Aug12-14 06:11 AM
Lsos
4 274
I'm trying to understand the kinematic equations well enough to explain to someone else, but the analogies I've come...
Aug12-14 02:14 AM
haruspex
3 182

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