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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
1 41,826
I saw a teacher today with a piece of chalk tied to the end of a string (for drawing circles and such on a chalk...
Jul10-09 02:52 PM
5 979
Hi, What is a good interpretation of electric permittivity? If you look at Coulomb's law, it seems that the...
Jul10-09 10:57 AM
3 11,765
I was a bit surprised to find that the average recorded atmospheric pressures at such locations as Mexico City (2.2 km...
Jul9-09 11:19 AM
Bob S
24 15,459
There are situations when a water drop falls on a really hot metal surface and, instead of evaporating, it kinda...
Jul9-09 08:22 AM
2 2,135
Hi There Can some one please help me find a table or chart that has accurate data for water pressures and...
Jul9-09 07:42 AM
1 4,967
I have a few extremely simple questions about thermodynamics... I'm trying to self study it, but a few things just...
Jul9-09 05:30 AM
5 1,057
I am working on a research project in which i need to create a uniform electric field inside of a tube. I am using a...
Jul9-09 05:25 AM
2 5,371
Consider a case where 2 people are in a car driving in a straight line at sufficient speed. At some point the driver...
Jul9-09 05:20 AM
8 1,377
How do you calculate amount of power needed to slowly rotate shaft under bending moment? This is not related to...
Jul8-09 11:59 PM
1 2,478
If you have a certain number of particles such as a few electrons and protons in an area, how would you determine the...
Jul8-09 11:09 PM
2 592
Hi! I'm interested on how a 45-gallon drum (filled with air) behaves when submerged in water. I did some...
Jul8-09 10:38 PM
9 4,924
Can anyone help explain how to convert velocities to different co ordinate systems? I've always been shocking at...
Jul8-09 10:33 PM
8 11,212
Tell me what makes electron have a charge , what is that property of electron due to which there is attraction...
Jul8-09 04:30 PM
5 701
Hi all. Could anybody please advise me some good books on Thermodynamics to begin with? My current level of Physics...
Jul8-09 03:25 PM
1 1,067
Does anyone know how to derive the following: \nabla x \vec{V} = -k...
Jul8-09 02:39 PM
0 553
Consider a toroidal solenoid powered by a sinusoidal voltage. This will lead to appearance of sourceless electric...
Jul8-09 09:12 AM
6 1,037
My specialization is Mechanical engineering. So I'm dumb to many of the electromagnetic concepts. But right now, I...
Jul8-09 08:11 AM
Andy Resnick
9 2,364
is there any one who wants to chat about it ? iv tried once here and got not 1 reply, not even the YOU HAVE DONE IT...
Jul8-09 07:39 AM
1 673
Hi all, I was wondering if anyone knew, or if anyone knows where I can find, the maximum magnetic field that a micro...
Jul8-09 07:05 AM
2 1,361
Hi, I'm a beginer with COMSOL. I work in diffusion process and I's been trying to simulate with COMSOL a very simple...
Jul8-09 04:30 AM
0 378
Hi There I'm wokring on a miniature steam car ~0.7kg. I've decided that I would like to investigate the feasibility...
Jul7-09 10:53 AM
Nick Bruno
4 1,408
Can a magnetized ship go to the South Magnetic Pole on its own accord? Let's say it is currently located in the...
Jul6-09 07:00 PM
8 1,499
Can anyone explain how to relate the bunch length and energy spread of a bunch in an electron storage ring to the...
Jul6-09 03:56 PM
Bob S
1 875
Hi! I'm working on a thing that could be simplified as a pendulum standing straight up. I've found some formulas on...
Jul6-09 02:31 PM
Bob S
2 652
I need an explanation that relates the equation to what I learned about the dot product of two vectors being the...
Jul6-09 01:21 PM
36 2,631
I have two spectra of a star across the visible and NIR. One spectrum comes from an online resource (CALSPEC) for...
Jul6-09 10:36 AM
2 649
can some one explain what chromatic dispersion is? and it helps me finding which colour radiates more heat in the...
Jul6-09 07:51 AM
Andy Resnick
1 1,025
What is the difference between eigenfriquency and normal mode? If, for example, I solve the secular equation (from the...
Jul6-09 06:08 AM
3 8,822
i want to ask can i model sloshing of fuel in satellite feul tank , to an energy sink model.... can anybody...
Jul5-09 07:38 PM
6 780
I though you might like a light break to solve a problem probably more interesting than the author intended. This is...
Jul5-09 08:49 AM
Jimmy Snyder
5 1,338
can some one explain me why,center of mass of an object can lie outside the surface of the object also?
Jul5-09 07:48 AM
6 1,126
Hi if i have lets say a rod swinging on a pivot, and i calculate the moment of inertia around the axis, which is...
Jul5-09 03:21 AM
8 826
I was thinking about it, and the only thing I could come up with is that it reduces friction with the surface the...
Jul5-09 12:29 AM
22 3,666
I've read the physical explanation for this eq is that magnetic monopoles do not exist. A poor explanation in my...
Jul4-09 09:28 PM
Count Iblis
46 3,186
Here are more unknows need to slove while I had only two equations which are sum of force on y-asix = 0 and sum of...
Jul4-09 12:41 PM
7 1,292
I'm looking for one clear, simple mathematical definition of action-angle variables. I believe they are also called...
Jul4-09 12:55 AM
1 1,883
I found interesting to me this topic and tryed to analyze. At...
Jul3-09 03:23 AM
5 1,910
When you drop a (strong) magnet into a copper pipe, it slows down. Is there an equation for calculating the force? I...
Jul2-09 05:42 PM
9 7,644
Hello, I read somewhere that the second derivatives of coordinates in Lagrangian would violate causality. Why is...
Jul2-09 11:36 AM
4 1,070
Dear all, I have a doubt on the validity of one of the Maxwell's equations, the one that states that the divergence...
Jul2-09 06:35 AM
5 690

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