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Apr22-11 05:26 AM
ZapperZ
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Hi everyone, I'm trying to design a formula that determines the launch velocity, launch angle, and time spent in...
Aug19-12 05:36 PM
Matthew_S
9 5,299
Hi, I have been trying to understand the fluctuation-dissipation theorem of statistical physics. I understand the...
Aug19-12 05:18 PM
Jano L.
1 539
Hi, Is it possible to help to accelerate an object with an Archimede Spiral ? We can apply a force F perpendiculary...
Aug19-12 05:15 PM
voko
3 478
Hi all, Problem ; Why a car consumes different amounts of fuel on two different roads with same characteristics...
Aug19-12 05:07 PM
voko
3 598
Does entropy decrease when stars are created from a dust? Does etropy decrease when water freezes?
Aug19-12 01:00 PM
Darwin123
2 567
Hello! This is my doubt: I have a particle with charge q and mass m with a relativistic velocity vu_x in a region...
Aug19-12 12:00 PM
Q-reeus
10 1,806
I'm doing a problem where I have to calculate the electric and magnetic fields. I've found B=0, so S=ExB=0. Has it got...
Aug19-12 11:55 AM
lailola
2 480
Dear Forum, I am familiar with the formulas between inertial frames of reference that move at a constant speed...
Aug19-12 11:02 AM
LastOneStanding
1 555
I am not able to figure out how to solve this problem. It does not seem to be a statics problem to me. At what point...
Aug19-12 09:08 AM
ashishsinghal
2 627
Hi, When using a multimeter to measure resistance, what is the used current level of the multimeter? I am using...
Aug19-12 07:01 AM
Si14
2 846
Hello, I am now studying centripetal force. and the problem is that centripetal force in gravitational field. ...
Aug19-12 04:33 AM
haruspex
1 425
Hello people, So i found out the tension in a ring rotating with constant angular velocity (in gravity free space)...
Aug19-12 04:31 AM
ShakyAsh
4 928
There is no net torque in this system so angular momentum should be conserved. I can't see how that is however. ...
Aug18-12 05:22 PM
Darwin123
20 1,558
Hi, Im working through some chapters of Goldstein and I'm up to canonical transformations now. On page 370 it says...
Aug18-12 10:33 AM
A_B
3 568
is it possible to construct a system with only finite number of point charges of arbitrary magnitude at finite...
Aug18-12 10:15 AM
bigerst
2 843
For the same material, same rectangular shape and the same length, The wider one or the narrow one will switch their...
Aug18-12 04:24 AM
kor
8 907
Hi all. When I was reading a paper...
Aug18-12 04:16 AM
Caloric
2 531
I have looked through my optics textbook and many websites about single-slit diffraction. They all end up deriving an...
Aug18-12 01:36 AM
alextx
2 840
Assume you have a sinusoidal 500THz function generator and assume you have a compatible antenna. If you feed the...
Aug18-12 12:32 AM
curiousatlarg
17 1,429
I know there is a difference between heat and temperature as once I was told what it is. I remember it being very...
Aug17-12 11:28 PM
haruspex
7 1,284
Asking in most general shape, why do signals from upper Ghz and above don't seem to travel in wires? Radio...
Aug17-12 10:43 PM
curiousatlarg
25 1,678
Hey guys and gals, this isn't actually an assignment of any sort, so I didn't want to put it in the homework section....
Aug17-12 07:10 PM
JackDP
11 946
Hi, my question regards the application of the fluctuation-dissipation theorem (Kubo - 1966 Rep. Prog. Phys. 29...
Aug17-12 05:47 PM
paloureiro
0 483
You are at the center of a sphere, and there is no net gravitational force on you. Which of the following do you most...
Aug17-12 05:44 PM
Andrew Mason
17 963
Hi, I am trying to figure out how to calculate the permeability constant of a lot of plastics by making solenoid...
Aug17-12 04:50 PM
berkeman
16 1,918
Can someone explain what exactly happens when a capacitor is charged? At the positive plate, are loosely bound...
Aug17-12 10:14 AM
mfb
1 507
Suppose I have say a 40' long 3/4" garden hose stretched out linearly on a level surface. One end is attached to a...
Aug16-12 06:49 PM
Studiot
7 934
Hello, I am going through Whittaker's treatise on Classical Mechanics. In chapter 3 he derives the equation of...
Aug16-12 05:28 PM
Muphrid
13 907
I am at the moment trying to do something different in the classical mathematical derivations of the equations for...
Aug16-12 04:29 PM
gabbagabbahey
9 674
1) Does anyone have a general idea of how to experimentally validate or falsify the Third Law of Thermodynamics...
Aug16-12 03:40 PM
Darwin123
4 961
Is it possible to construct a portable ground using an positively charged electret? I think it would be useful to a...
Aug16-12 02:04 PM
kmarinas86
22 1,738
So I am studying about waveguides and I am going through all this mathematics and then I realized that I do not...
Aug16-12 10:44 AM
marcusl
4 776
Hello! this is my first post here,hope it's the good part of the forum. I have some questions and i would...
Aug16-12 08:03 AM
Hassan2
1 865
Hi Physicsforums I am re-learning classical mechanics and having a tough time dealing with a certain line from...
Aug16-12 02:17 AM
sempiris
0 489
Hi all! I have been goofing around with antennas and wi fi radio equipment. Now I have a million questions about...
Aug15-12 11:11 PM
curiousatlarg
0 475
Example: A common problem in undergraduate electromagnetic classes is calculating the electric field inside a solid...
Aug15-12 07:26 PM
Only a Mirage
9 1,872
Is shown like this in my book: Consider a rotating body with an angular acceleration α. There must be a tangential...
Aug15-12 03:27 PM
aaaa202
16 1,691
Right, so I was going over some old (basic) electromagnetism principles (to make sure it doesn't all fall out of my...
Aug15-12 01:24 PM
Tipox
31 3,703
It is said that toroidal inductors/coils (see http://fa.tu-sofia.bg/te/Brandisky/images/toroidal_coil.jpg) that are...
Aug15-12 11:40 AM
-dove
1 1,079
When a car turns too fast, it skids away from the center and I don't understand how that's possible in terms of...
Aug15-12 10:24 AM
harrylin
11 1,082

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