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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 46,034
Consider the following problem: A spring with spring constant ##k## is suspended vertically from a fixed support and...
Jul14-14 07:42 PM
Matterwave
5 770
I was wondering if someone could show me the derivation of Faraday's Law of induction from the more fundamental...
Jul14-14 07:11 PM
TumblingDice
3 649
I learned that momentum conservation is vectorial, and now, when i read about perfect elastic collisions, I can't...
Jul14-14 10:52 AM
olivermsun
1 660
I can do circuit problems, but conceptually I cannot figure out what is going on from a basic physics perspective,...
Jul14-14 10:31 AM
DeltaČ
9 972
Please find the attachment and comment about equation (2).
Jul14-14 08:58 AM
DaleSpam
75 4,901
I can see the purpose of J for currents taking place in a volume like, say.. plasma physics but for current in a...
Jul14-14 06:06 AM
UltrafastPED
1 584
I have seen in a number of thermodynamics lectures that the entropy change of a system as it falls approximately...
Jul14-14 02:39 AM
nayanm
16 1,264
Hi all, Can someone clarify whether the following is right? Assume a Cylindrical tank with a base area of 2000...
Jul13-14 11:24 PM
user100
5 794
For twice differentiable path x:\to\mathbb{R}^N the action is defined as S(x) = \int\limits_{t_A}^{t_B}...
Jul13-14 08:35 PM
UltrafastPED
2 568
Figured it out thanks, next post:
Jul13-14 08:02 PM
TSC
2 672
Hey guys I'm looking for. Some more info on eddies current. I understand how it works but all the examples I see use...
Jul13-14 11:06 AM
Ziggey
2 587
I want to calculate the field distortion caused by placing a conducting spheroid in a uniform electric field. The...
Jul13-14 04:42 AM
Shyan
2 563
I am working with a single mode fiber at 830 nm with a NA of 0.12...
Jul13-14 12:10 AM
rigetFrog
1 693
How is electromagnetism different from gravity in that accelerated objects radiate EM waves when accelerated in an...
Jul12-14 05:39 PM
WannabeNewton
8 969
this is a homework problem i realized after posting it. so could a moderator please move this question to the hw...
Jul12-14 04:54 PM
UltrafastPED
1 560
This is related to classical Hamiltonian mechanics. There is something wrong in the following argument but I cannot...
Jul12-14 05:46 AM
Matterwave
1 640
What are your opinions about these two experiments described at: http://adsind.wordpress.com? Can they be used to...
Jul11-14 01:45 PM
micromass
5 652
I am trying to understand why I can specify the specific volume v of a fluid element as a function of the equilibrium...
Jul11-14 12:34 PM
WannabeNewton
3 684
This is a problem I thought up. If I'm correct as far as I've gone, the answer is rather surprising. A thin but...
Jul11-14 12:26 PM
MrAnchovy
16 1,465
I understand that when an electron is excited it goes to a higher energy level and then relaxes to ground state...
Jul11-14 11:57 AM
Bandersnatch
1 509
Hello, Been a while since I posted on here, nice to be back :) . I just want some pointers as to the methodology...
Jul11-14 08:45 AM
Mech King
3 761
I have come to learn that the Doppler shift equation is asymmetric. That is, the Doppler shift is not the same when...
Jul11-14 07:47 AM
user3
7 648
We know that the main use of capacitor is to store charge in the form of electric field,and we want it to store as...
Jul11-14 01:44 AM
phoenixXL
1 551
I feel I understand what happens, and how to solve the equation of motion x(t) for a mass attached to a spring and...
Jul10-14 06:19 PM
Edge Of Pain
7 779
The power density of an electromagnetic wave is proportional to the absolute square of the electric field |E|^2...
Jul9-14 09:05 PM
Andy Resnick
2 1,233
Please help me qualitatively in the following points : 1) If in a system(consider a cylinder) fixed with a piston ,...
Jul9-14 11:14 AM
Philip Wood
2 749
hai friends, i would like to know what would happen to three isolated point separated by infinite...
Jul9-14 09:39 AM
jbriggs444
1 714
Hi, I have a question I'd like some help with which is related to my job working with drill rigs. Where you have...
Jul9-14 07:43 AM
256bits
6 907
Why do we take Θ=90° for calculation of potential energy
Jul9-14 06:11 AM
physicsjn
1 727
Hello! It has been years since I had physics at uni, and I have forgotten lots of it, so I need some help here. The...
Jul8-14 01:20 PM
home-owner
0 670
I know that in the vector potential formulation one can use a scalar Green function (to find the said potential and...
Jul8-14 12:50 PM
Apollo2010
3 1,042
Hi guys, I hope this is the correct section otherwise I apologize :).The goal is to find the capacity of a non linear...
Jul8-14 10:15 AM
rinale84
6 690
I'm looking to find the resultant force of three forces and a moment: Fx, Fy, Fz, and Mx. I intend to graph multiple...
Jul8-14 06:07 AM
Smijo
2 799
Hi all, I am looking into induced electric fields by changing B fields inside layers of dielectric. For example, if...
Jul8-14 05:13 AM
vanhees71
10 1,057
I tried to make the title as descriptive as I could without being overly long. Anyway, I've been trying to work...
Jul7-14 11:12 PM
elegysix
6 1,826
Hello. I have a question about experiment. You know it. You need beer bottle, water and ping pong ball. You...
Jul7-14 10:56 PM
elegysix
1 649
Are these two, wave number and wave mode, same thing? If not, what is the difference? Thanks...
Jul7-14 09:00 PM
Simon Bridge
10 1,200
Hi I'm trying to model the drag effects in using Lagrange Mechanics and trying to include the effects of...
Jul7-14 04:45 PM
rigetFrog
1 1,028
Hello Physics Forums I need a little help wrapping my head around the concept of lambertian emitters as compared to...
Jul7-14 04:41 PM
rigetFrog
1 758
Finding the magnetic field for a straight wire using the right hand rule shows that the field is around the wire. ...
Jul7-14 02:15 PM
UltrafastPED
1 597

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