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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 47,799
Hi all, I'm working with the heat capacities definition and I have got a confusion. I don't understand why we can...
Jan28-12 03:52 PM
dapias09
5 1,645
Hello all, I'm confused with the center of mass concept. Regard the following problem, we have a spring with...
Feb5-12 12:37 PM
James_Harford
3 1,180
Hi, can anyone help me to understand why the pressure of a ideal solid is zero?. In my class we calculated this in...
Apr14-12 03:17 PM
dapias09
0 735
Hi all, Can anyone explain me why the ratio Cp/Cv is infinite for a photon gas? Thank you in advance. Diego.
Jun4-12 12:12 PM
dapias09
0 1,011
uhm, can somebody help me about this subject? i find it very hard. i'm using foundations of statistical and thermal...
Sep12-07 09:59 AM
dareymon
0 1,496
Hi . I am making a robot that is supposed to detect a red ball with a camera, and then know where the ball is . The...
Jul7-11 06:23 AM
Born2bwire
4 3,092
Hi there, does any of you know a place where I can find the derivation of the hydrodynamic equations (navier stokes,...
Jun1-12 11:38 AM
Andy Resnick
2 907
When I was a kid listening to a transistor radio under my pillow late at night I used to wonder whether turning the...
Oct1-11 06:24 PM
vk6kro
2 988
The power generated from the aerogenerator is from the kinetic energy of the wind which pass throught it. So, after...
Aug29-04 10:30 AM
Clausius2
20 4,350
The situation is there is a ball attached to a string in a car, and the angle that the string makes is measured when...
Nov6-11 02:15 PM
DarkBlitz
2 2,047
Hey, I came across this question in my text book, and there isnt an answer for it in the back, so I would just like...
Jan12-12 12:51 PM
DarkBlitz
4 1,404
Hey, I was doing some revison for a test and i came across this question which I cant get my head around a...
Jan16-12 11:18 AM
AlephZero
5 1,377
I am having some trouble understanding the concept of electromagnetic waves, I suppose because I expect them to be...
Dec23-08 03:38 AM
valleyman
1 1,247
I was under the impression that everything was at least slightly, even if imperceptibly, magnetic because all matter...
Jun11-10 12:24 AM
netheril96
5 3,214
Why do scientists say that certain conditions hold in a vacuum despite the fact that no vacuums exist or are known to...
Jun23-11 01:44 PM
I like Serena
4 1,019
Hey everyone! I recently picked up a motorcycle for class/work commutes because walking home at 11pm from the lab...
Apr27-09 08:01 AM
Andy Resnick
5 1,320
Hello, its my first time in this forum, i've registered because sometimes i have some physics questions during my free...
Aug31-11 02:16 PM
DarkFalz
5 1,931
Hello, i have the following questions. Lets assume that i throw a ball with mass 1kg and velocity 10 m/s at a wall...
Mar2-12 09:39 PM
apb000
2 735
Hello, first of all, I must say that I am quite knowledge lacking in the thermodynamics topic, I am just seeking some...
Dec6-13 01:03 AM
Simon Bridge
17 1,021
For several years i have thought about air (fluid) resistance without getting deeper into the formulas that model its...
Jan8-14 05:14 PM
A.T.
1 476
I am in a disagreement with someone on another forum. There is wheel with a freewheeling hub constrained to roll...
Jun15-10 08:33 PM
K^2
15 3,021
Hi! I'm reading this paper on fluid dynamics: http://jcp.aip.org/resource/1/jcpsa6/v50/i11/p4831_s1 Its equation...
Aug20-12 02:07 PM
DarkLindt
1 417
I'm writing up a prac that involved LCR circuits. One part of the prac involved measuring the phase difference...
Sep11-10 11:57 AM
Bob S
1 1,602
Hamilton's principle is described as \deltaI=\delta\intL dt = 0 so as the action is stationary. This...
Feb2-12 08:00 PM
Darkmisc
2 1,897
How did Hamilton work out that action is the stationary quantity for a mechanical system? I've seen proofs that...
Feb4-12 04:03 AM
ardie
1 1,117
i know triple point is the temp. that water's(here use water as example) solid、liquid、gas state can be existent . ...
Feb24-10 10:46 AM
Gokul43201
2 861
Is there any way possible a magnetic field can cancel out an electric field? Thanks !
May17-11 01:30 PM
berkeman
6 3,728
is there a way to keep inertia in circular motin?
Oct9-04 02:44 AM
spacetime
5 4,318
Something strange showed up while I was thinking about the following problem: I'd like to prove, by the only mean of...
Jun13-09 08:55 AM
Mapes
3 856
Hello everyone, I am trying to understand COMSOL 3.5 and I am interested in Photonic crystal fibres and tapered...
Jan15-10 01:34 PM
multiphysics
3 4,212
Hello, In this problem: http://www.physics.harvard.edu/academics/undergrad/probweek/prob1.pdf Two balls are...
Feb15-09 04:03 PM
darkSun
2 1,365
Let's say we have an electric field, (ax, 0, 0). (a is a constant) The divergence of the field is a, so the...
Jul13-09 03:22 PM
clem
4 5,908
Hello, I have a question about a spinning symmetric top: When the equations of motion are solved, they are solved...
Aug27-10 12:30 AM
darkSun
8 2,196
i understand what a sine wave is, as well as the hertz. but im curious as to why all energy travels in a wave and not...
Dec26-09 09:35 AM
dE_logics
4 5,499
This is the material i read from textbook, and it doesnt make any sense to me!! can somebody plz help me out if they...
Sep25-07 06:37 PM
TVP45
4 4,130
This is one of the Maxwell's Equations that I cant understand: \oint E.dl = -\int dB/dt .dS From what I...
Oct4-07 09:57 AM
vanesch
4 2,317
So my professor has been kind of lazy lately. he goes through a lot of problems on the chalkboard half way till he...
Oct28-09 11:41 PM
cesiumfrog
2 749
HEllo All, I'm self studying Thermal physics with Zemansky & Dittman's book, "Heat and Thermodynamics"....
Dec30-13 06:13 AM
Dark_chaos
0 691
Hey. Suppose a mass is attached to two springs, one on each side, and they have different values for k. If you...
Sep29-11 05:36 PM
darrenhb
4 2,417
What exactly does "fixed volume" mean in thermodynamics, for a liquid? Does it mean that the container volume is...
Feb9-11 11:33 AM
Studiot
1 3,985

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