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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 41,832
Obviously it has to taper from the fixed end to the most mobile one. Or from the centre (node) of a symmetrical one...
Jun14-09 11:47 PM
silverslith
0 699
I just have some confusion about whether or not self-inductance will occur in an AC generator. The current is...
Jun14-09 10:12 PM
Yuqing
0 1,246
First I apologize if this has been asked before; however, did a google search of the archives and could not find...
Jun14-09 08:36 PM
piareround
2 723
Is the second law of thermodynamics fundamental? Like Newton's laws for example. I'm having doubts about the...
Jun14-09 04:28 PM
fluidistic
18 3,273
In the defining the concept of "work", does it have to a defined as a force being applied to an object over a LINEAR...
Jun14-09 12:41 PM
Dr.D
2 590
When two magnets are taped together with both north sides touching does the magnetic flux stay in its normal possition...
Jun14-09 11:42 AM
wbrad320
9 2,119
Thought experiment: a sealed container with water in it, along with a balloon. You are able to control the balloon...
Jun14-09 07:42 AM
Stan_Smith
86 7,413
Hi.. Ive been trying to solve this problem for a couple of weeks and I need fresh ideas...its a 30 degree piece of...
Jun13-09 11:56 PM
Born2bwire
3 629
Hi all, Does anybody know the equations needed to predict the diffraction of electromagnetic waves by a perfectly...
Jun13-09 11:52 PM
Born2bwire
7 1,235
Can angular momentum change into linear momentum and vice versa? For instance, when a top spins, and it stops, isn't...
Jun13-09 11:07 PM
atyy
1 1,586
Is there a simple way to understand why the Lagrangian of the classical electrodynamic field is (in SI units) ...
Jun13-09 04:11 PM
GiftOfPlasma
2 1,228
Hi all, this is my first post to the forum. I've been thinking about a mechanism that can't work, but I can't...
Jun13-09 12:43 PM
Doc Al
3 743
Hey i m a newbie suppose i drill a hole that passes through the centre of earth and reaches the other point on...
Jun13-09 11:46 AM
Weston
21 2,337
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
3 813
The path integral of force is the work, something that has a clear physical meaning we can relate to. My question is,...
Jun13-09 06:07 AM
maze
2 1,217
If a transformer with coil ratios 2:1 creates a voltage twice that of the primary in the secondary coil why is the...
Jun13-09 12:50 AM
cabraham
1 587
What will be the Gravitaional force between two bodies when the distance between them is zero e.g., If we place a...
Jun12-09 07:54 PM
DaveC426913
9 3,724
"A 0.400-kg pendulum bob passes through the lowest part of its path at a speed of 3.00 m/s. What is the tension in...
Jun12-09 07:22 PM
diazona
3 1,215
I'm running an experiment where I drop a mass (99.7kg) a distance of 1.8m. The load is suspended from a very rigid...
Jun12-09 12:51 PM
jimbojones21
0 1,509
Why is breaking with the wheels turning more effective than when the wheel locks up? Is it because there is more...
Jun12-09 12:08 PM
russ_watters
9 944
how do we say that in a beam bending problem the bean cross section bends(rotates)around the centroidal axis. Why not...
Jun12-09 08:16 AM
fdm44241
2 2,157
can any one give imput please,i have a problem with Youngs two slit experiment,if i remove the lens from the laser,you...
Jun12-09 06:44 AM
kevinfr0st
1 904
In Hal Clement's classic tale "Close to Critical" the planet Tenebra has an atmospheric pressure of 800 bar, 3 gee...
Jun12-09 03:49 AM
qraal
0 493
I need to calculate the tension on a cable. cable comes off a winch, travels up at a 45 deg angle over a pulley which...
Jun12-09 12:07 AM
berkeman
3 2,884
Hi all, I hope this is right place to post this question (this is not a homework question). I wanted to find out...
Jun11-09 10:30 PM
Dr.D
5 1,760
What is the thermodynamical reason that a car's maximum fuel efficiency is for speeds 55-60 mph? (See...
Jun11-09 07:48 PM
Bob S
1 1,456
In my radiative processes in astrophysics course I'd often see something like this: I_\nu (\mathbf{r}, \mathbf{k},...
Jun11-09 12:07 PM
cepheid
2 673
Hi.. I have a question about AC magnetic field, wondering if you can help me understand this. For a DC solenoid...
Jun11-09 12:00 PM
Bob S
11 13,025
My physics book says the angle of diffraction is approximately wavelength/length of opening (or obstacle). My...
Jun11-09 11:38 AM
ranger275
0 484
I have some trouble understanding how changing flux produces a field. For example, I know that a changing magnetic...
Jun11-09 12:12 AM
ExactlySolved
6 3,606
soo... this is my first post and I'd like to start out by thanking the PF people for existing and helping the resting...
Jun10-09 09:05 PM
thepip3r
6 814
I'm trying to reconcile some concepts in electrostatics and dynamics to do with electric fields in conductors. The...
Jun10-09 05:25 AM
parsec
0 1,643
What is Einstein temperature? I know how to calculate it but I don't understard what it means...
Jun10-09 12:52 AM
kanato
1 1,405
Why does fly fly? The theory based on Bernoulli's law fail to explain it since the wings of fly are flat, not curved...
Jun10-09 12:42 AM
Cyrus
44 2,700
if an orbiting electron positron pair is moving through space with net momentum p and the 2 particles then annihilate...
Jun9-09 04:40 PM
benk99nenm312
48 6,178
Hey guys, There is something I have known and applied for a long time, that the greater the length of an...
Jun9-09 02:27 PM
DrGreg
2 773
If you throw a baseball up on the moon, and it comes down, how is momentum conserved?
Jun9-09 12:08 PM
Doc Al
5 861
when we apply potential difference across any conductor the electric field set up in the conductor which apply force...
Jun9-09 11:57 AM
Bob S
6 1,520
Since the magnetic force on a moving charged particle is qv X B, the work done by a static magnetic field is always...
Jun9-09 05:41 AM
neha_dodeja
34 6,541
so, hey...I'm pretty new to these forums and just needed help understanding a textbook that i'm reading. I'll...
Jun9-09 05:21 AM
tiny-tim
3 1,845

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