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- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
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Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people...
Apr22-11 05:26 AM
ZapperZ
1 41,818
We are all familiar with the description of a wave as being the ripples on a pond with water being the displacement...
Jun27-12 10:51 AM
harrylin
77 9,385
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 9,366
is it, cause velocity isn't.
Jan15-11 04:12 PM
Mueiz
60 9,353
I've found this video on the web: http://www.youtube.com/watch?v=TIhPayFBE9c&feature=related and id like to be able...
Sep12-09 05:31 AM
Born2bwire
11 9,348
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 9,338
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
marcusl
2 9,283
We did an experiment of measuring AC mains frequency using sonometer. In the experiment an electromagnet was vibrating...
Jun26-10 11:46 AM
graphene
1 9,279
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 9,264
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 9,246
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 9,241
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 9,237
If a cantilever beam is subject to forced vibration (from a shaker at fixed end), what will the effect be of placing a...
Mar3-05 09:24 AM
Doc Al
1 9,232
Okay, and odd title, but let me continue. I recently read a 15+ page argument on another board about what would...
Feb26-10 05:51 AM
Lsos
23 9,224
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 9,219
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 9,210
I understand that using F = qv x B and the fact that positive currents generate counter clockwise magnetic fields, it...
Dec12-10 02:21 PM
compter
7 9,207
This is a simple enough question, but no one has been able to give me a satisfying explanation. Most people compare...
Oct12-12 05:51 AM
CWatters
25 9,198
I am looking for a formula to determine what speed an object will fall with a known height and weight. For example a...
Jun22-08 03:52 AM
stewartcs
5 9,190
Hey everyone, I'm a bit confused with the meanings of f, g, and fg subscripts in the thermo steam tables (e.g. hf,...
Apr17-11 01:25 PM
AriAstronomer
2 9,175
Dear forum users Firstly, I wanted to post in the General Physics area, but it wouldn't let me create a new thread...
Apr12-09 05:45 PM
Fullperson
3 9,121
Is heat always the factor that determines the colour of a flame? Is there a way of approximating the variations in...
Aug20-04 05:01 PM
vsage
10 9,112
Recently I was going through the derivation of wave equation I want to discuss it to get my concepts fully clear by...
Dec1-10 02:58 PM
emailanmol
10 9,111
So here's a pretty straightforward question. Given a cylinder with some specific mass and radius rolling down an...
Feb23-07 10:59 AM
arunma
5 9,099
Trying to verify the general integral solution to Poisson's equation I reach the following contradiction, what am I...
Nov30-07 05:23 AM
jmb
10 9,099
Do photons in the form of visible light actually pass through ordinary window glass? I ask because window glass is...
Jun21-05 05:27 PM
Swampeast Mike
14 9,084
As water is pulled into an opening by gravity, it begins to spin. Why does it spin?
Apr21-08 01:34 AM
kamerling
34 9,081
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 9,048
Does any one know the proof for newton's law of gravity, because i looked in a lot of books for this proof but i...
Jun15-05 05:32 AM
Juan R.
18 9,030
Dear all, i am a bit confused with a very simple equation connecting refractive index of water and its dielectric...
Nov12-09 03:16 AM
SHeck
4 9,008
I know it's old already.. but this came up when I was lecturing my mom on the evil effects of urban myths and stuff.....
Feb8-08 03:04 PM
mgb_phys
11 8,998
Hai, I have the following situation: I have a closed container with a certain gas at a certain...
Feb9-05 05:14 AM
Clausius2
9 8,997
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 8,995
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 8,983
correct me if wrong an accelerometer consists of a mass(proof mass). say the proof mass is x kg. The accelerometer...
Aug23-06 08:51 AM
WhyIsItSo
2 8,967
is proton volt = electron volt? if yes then why? even if proton is 1840 times massive then electron and eV Is work...
Apr7-04 05:41 PM
chroot
3 8,938
Anyone ever gotten the physical interpretation of S (if it has a reasonable one?) ? ... I'm remembering something like...
Nov8-04 01:58 PM
PerennialII
0 8,935
I was just wondering how these amazing engineering feats support the loads on their wings? Specifically the larger...
Jun24-08 01:37 AM
russ_watters
9 8,934
Why does the charge on a conductor accumulate at sharp points? I've read one or two explanations, but I don't follow...
May18-08 11:33 PM
Shooting Star
10 8,927
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 8,923
(...) a torque τ applied perpendicular to the axis of rotation, and therefore perpendicular to L, results in a motion...
Mar1-06 03:32 PM
panathi
8 8,922

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