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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 48,251
Is the kinetic energy of a (not necessarily homogeneous) rigid body in translational motion and rotating about its CM...
Nov12-06 01:00 AM
jtbell
10 10,096
Can somebody explain to me the differences between the ensembles, and how does this differences refer to experiment? ...
Jan29-11 03:58 PM
paweld
1 10,091
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 10,084
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
PhysMaster
7 10,058
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
mishi003
7 10,054
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
quantoshake11
2 10,044
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
ikhlaq
5 10,033
Permanent magnets are advertised as having some scalar strength, say, 1.5 Teslas, depending on the composition of the...
Mar18-09 08:34 AM
clem
5 10,031
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
ael65
3 10,025
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 10,023
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
conway
15 10,020
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
mikelepore
4 10,019
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
atyy
3 9,970
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
rayjohn01
31 9,965
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
alexepascual
43 9,921
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
Darwin123
129 9,912
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
Bystander
13 9,911
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 9,909
I am having trouble going about proving the Lorentz invariance and non-Galilean invariance of Maxwell's equations. ...
Nov27-07 03:13 AM
Mentz114
4 9,884
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
rcgldr
7 9,862
is it, cause velocity isn't.
Jan15-11 04:12 PM
Mueiz
60 9,854
I've been trying to derive the Stefan-Boltzmann law using thermodynamics, and have resorted to looking up the...
Mar15-12 01:59 AM
Tub46542
20 9,823
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
Redbelly98
5 9,814
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
DaveC426913
30 9,808
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
AzeemA
6 9,792
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
LLT
7 9,780
I am a bit confused when doing questions about 2 masses connected by a pulley system. Sometimes i get the right...
Jun20-10 11:46 PM
K^2
1 9,771
Could someone explain me in detail the differences between an inertial reference frame and a non-inertial reference...
Jan16-05 07:32 AM
marlon
3 9,768
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
pardesi
0 9,768
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 9,760
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
PerennialII
6 9,734
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
russ_watters
24 9,716
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 9,709
Our local YMCA is putting on an indoor triathlon and I am trying to come up with a formula to help them determine the...
Mar16-11 11:11 AM
Rap
13 9,709
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
dextercioby
10 9,704
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
JonasS
9 9,702
can the net force on an object be zero yet the velocity not be zero? I say yes but under what conditions and must any...
Jun4-05 06:12 PM
paulom2001
12 9,702
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
russ_watters
5 9,702
As water is pulled into an opening by gravity, it begins to spin. Why does it spin?
Apr21-08 01:34 AM
kamerling
34 9,695
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
Eidnar1
22 9,686

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