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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 47,915
Hello, I have a quick question that I imagine anyone who has studied physics or math at a university can answer...
Jan13-12 06:46 AM
Claude Bile
48 10,031
Hello. I'm having troubles solving the enthalpy for an ideal gas. From the equation H=U+PV, i could find H...
May15-10 08:41 AM
2 10,012
I've attached a diagram of a bar magnet being plunged into a solenoid. I'd like someone to explain the direction of...
Jan23-12 08:08 AM
7 10,006
There's a simple explanation that wasn't covered in the last thread about this. Start off with an ideal...
Nov6-07 11:49 PM
3 10,000
A friend and I are having a debate on this and I just need to know yes or no, and why?
Oct20-10 07:18 PM
15 9,998
From experiment, it's easy to see that if we balance an industrial sized broom with one finger at it's center of...
Jan4-07 06:14 PM
7 9,988
Can somebody explain to me the differences between the ensembles, and how does this differences refer to experiment? ...
Jan29-11 03:58 PM
1 9,988
Permanent magnets are advertised as having some scalar strength, say, 1.5 Teslas, depending on the composition of the...
Mar18-09 08:34 AM
5 9,986
What are you able to derive or integrate from a voltage vs. time graph? Like if I have a battery and a resistor and...
Oct21-09 03:15 AM
4 9,977
Hi, has anybody worked with heat pumps? I'm recently confused about how the heat pump compressor operates. Does it...
Jan21-11 01:22 AM
5 9,975
Say we have a simple circuit with just a battery and two capacitors. Why must the voltage of each capacitor in series...
Feb16-09 10:02 PM
3 9,956
So, I have a few questions regarding some of the laws of electromagnetism. While I was in school, one of my...
Nov9-09 02:28 PM
Bob S
17 9,936
Hi, From knowing that the 3D harmonic oscillator has 3 degrees of freedom, how do you conclude that the average total...
Sep29-09 07:43 AM
15 9,925
Evryone knows that the work done by a magnetic field is zero. Then how does a permanent magnet lift iron filings.
Aug6-04 10:13 AM
31 9,907
Hey can neone tell me why this is so? I have not got the ans in any book i read... Thnx 4 replying
Jun17-08 09:37 AM
Count Iblis
8 9,864
While I understand the use of the Lagrangian in Hamilton's principle, I have the gut feeling that there is more to it...
Sep29-04 10:12 AM
43 9,859
Is the amount of energy needed to raise the temperature of a substance linear or not? For instance, would it take the...
Jan10-04 02:38 AM
13 9,850
I am having trouble going about proving the Lorentz invariance and non-Galilean invariance of Maxwell's equations. ...
Nov27-07 03:13 AM
4 9,844
Mass on a string undergoing uniform circular motion by hand: I was taught that the centripetal force F = mV^2/R is...
Feb5-10 01:27 AM
7 9,802
is it, cause velocity isn't.
Jan15-11 04:12 PM
60 9,798
Hello physics forum crew, I would like some help coming up with one of those "is this possible" type questions. ...
Jul19-12 09:54 AM
129 9,788
any good website suggested on coupled pendulum? I have to do an investigation and I'm going to investigate simple...
Nov17-03 03:33 PM
7 9,768
Hi! Great website I just wished I had discovered it earlier. :smile: Here is my simple question and I would...
Dec23-09 05:38 AM
6 9,760
i saw the 'proof' of the wave equation for a sound wave in a medium assuming the wave equation for a dissplacement...
Nov17-07 09:49 PM
0 9,756
I was just wondering if anyone has any idea on how I would go about working this out. I have performed the experiments...
Sep28-08 09:35 AM
5 9,749
Could someone explain me in detail the differences between an inertial reference frame and a non-inertial reference...
Jan16-05 07:32 AM
3 9,733
I have found a website which claims that rubber bands obey a force law F=-kT(x-\frac{1}{x^2}) x=\frac{L}{L_0} ...
Oct26-04 02:50 PM
6 9,706
Hi I have a hard time understanding what the curl really means in Maxwell's equations, for example in a steady-state...
Mar6-06 05:41 AM
10 9,671
Could someone please give me some examples of natural non-living processes where entropy decreases locally ? Now I...
Mar26-11 06:10 AM
I like Serena
4 9,662
I've been trying to derive the Stefan-Boltzmann law using thermodynamics, and have resorted to looking up the...
Mar15-12 01:59 AM
20 9,662
I'm having trouble understand this proof of Carnot's theorem, and I would appreciate it if someone could point out...
May15-13 10:10 AM
Swarnali Hait
4 9,660
Hi All, I'm doing a study on effects of outside temperature on the energy efficiency of air-conditioning systems in...
Feb26-10 07:33 PM
5 9,649
As water is pulled into an opening by gravity, it begins to spin. Why does it spin?
Apr21-08 01:34 AM
34 9,645
Hello all. I am doing some research on the space shuttle for a class project, and I am having some problems with my...
Jul16-04 11:47 AM
9 9,641
I was wondering if there was anyway for me to calculate pressure, velocity, momentum and more on a bottle rocket made...
Oct9-06 01:56 PM
2 9,635
I was wondering how quickly a permanent magnet would loose its magnetism if it was constantly being used to do work,...
Mar8-09 07:20 PM
24 9,615
I've found this video on the web: and id like to be able...
Sep12-09 05:31 AM
11 9,610
Okay, im new so if what im talking about makes no sense, be easy...i dont really know if it belongs in classical...
Mar26-09 11:20 PM
22 9,607
I have recently taken an interest in the idea that all pendulums of the same length are isochronous, and am currently...
May24-07 09:30 PM
3 9,597
I read that the speed of sound in air at 20 degrees celsius is about 1126 feet per second. When I shoot my rifle,...
Sep22-11 08:04 AM
30 9,586

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