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Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
47,906 
I am quite confused when my lecturer told me that the mass of an object doesn't affect the static friction.
F = μN...

Jul613 09:13 AM
null void

7 
654 
Hello,
I was taught that moving charges in an external magnetic field experience force. Okay. I wondered that if...

Jul613 06:17 AM
mfb

3 
579 
Distance is a key variable with fields, however, why is it, in any field(Gravitational,Electric,Magnetic) as "d"...

Jul613 04:05 AM
Shyan

3 
600 
I have to be honest, the principle of least action seems to me more of a religious claim one takes on complete faith,...

Jul513 08:03 PM
dimwatt

8 
1,093 
Dear all,
I am thinking of a simple situation:
A cube is falling under the force of gravity. It is not in a...

Jul513 06:10 PM
Bandersnatch

3 
533 
The basic set up for a homopolar generator has a stationary magnet and a rotating conducting plate with contacts at...

Jul513 02:12 AM
Simon Bridge

3 
605 
I am a high school physics teacher and I've been trying out an experiment for my students. I used a manometer (a...

Jul413 03:09 PM
technician

5 
815 
can someone please provide me with a proof or even just an intuitive explanation

Jul413 12:03 PM
Naty1

1 
392 
If an arbitrary shaped conductor is moving through a steadystate magnetic field, \mathbf{B}(\mathbf{r}), is it true...

Jul413 11:13 AM
mfb

1 
363 
Hi,
I've seen a couple of posts in the Homework section of Physics Forums about the fields of solenoids, but...

Jul413 10:29 AM
BruceW

10 
2,041 
Here's a puzzler:
I have a NdFeB ring magnet, 1.75" outer diameter x 1.375" inner diameter x 0.25" thick, N40 grade....

Jul313 10:49 AM
jtbell

9 
1,230 
My graduate course (2 sem) follows Goldstein (All chapters :surprised). Can anyone suggest me a book with solved...

Jul313 10:12 AM
kulkajinkya

1 
636 
Chapter 4. eq. 4.28 4.30
u = u0 + (x  x0)(du/dx) + (y  y0)(du/dy) + (z  z0)(du/dz)
v= ...
w = ......

Jul313 09:47 AM
knockout_artist

2 
1,353 
I'm doing a research project currently and basically what I have is a camera measuring a probe. I have designed the...

Jul313 08:20 AM
spaderdabomb

1 
624 
I know that v(t)=dx/dt
Then what is v(x) and how?
Is it also dx/dt or something else?

Jul313 07:10 AM
AakashPandita

18 
1,411 
Hello,
For the last 2 months I've been trying to find a relation between a frequency magnetic field and the amount...

Jul313 02:24 AM
Erik88

5 
611 
Hello,
Suppose we pass a horizontal plane through the earths equator. Over a period of a year how is the variation of...

Jul313 01:03 AM
Simon Bridge

5 
549 
(My last http://www.physicsforums.com/showthread.php?p=4424810#post4424810 post did not get much attention so I try...

Jul213 06:07 PM
Order

2 
738 
Hi. Consider a solid body placed in vacuum. How much is its pressure? Can we describe this body using thermodynamics...

Jul213 04:04 PM
mfb

1 
357 
Hello all,
I am trying to model a received laser signal, x(t), reflected off a moving target. I am currently...

Jul213 01:50 PM
jmountney

0 
368 
I was asked this question and couldn't think of a good answer. In a room there's infinite different light waves going...

Jul213 01:12 PM
technician

19 
1,725 
Consider a hypothetical particle with no mass (like a neutrino or photon, in that sense), but with pure charge.
...

Jul213 07:09 AM
BruceW

7 
718 
Heat of vaporization of water slightly decreases with temperature.
...

Jul213 04:02 AM
Jano L.

12 
1,936 
Hi all, suppose that i have three forces exerting to support a flat piece of uniform object.(Imagine a 3 cylinders...

Jul113 10:32 PM
bahamagreen

1 
355 
Consider a newtonian reflector telescope:
http://i.imgur.com/9BLmhlf.jpg
As you can see in the image, the little...

Jul113 09:29 PM
halfelven

7 
1,089 
This is part of the derivation of vector magnetic potential of a small current loop center at origin and on xy plane....

Jul113 05:59 PM
yungman

13 
647 
Hi everybody,
I was reading about the application range of quantum mechanics. I found the effects of quantum...

Jul113 04:40 PM
vanhees71

14 
1,237 
The wikipedia article I quote below is confusing me. I followed the links to Frank Lambert's website, where he claims...

Jul113 02:26 PM
andrebourbaki

39 
7,837 
So I have been trying to figure out some orientation data that I gather from a triaxial gyroscope, and figure out my...

Jul113 09:10 AM
DarthBane

9 
704 
We all know the air at the ceiling is warmer than the air at the floor because "hot air rises" due to the density...

Jul113 07:28 AM
NascentOxygen

5 
2,409 
What would happen if you take the wedge of the magnetic field and the velocity of a charged particle, you get the...

Jul113 12:09 AM
WannabeNewton

11 
557 
How in microscope there is a phenomena of differaction, and in case of telescope there is interference of light...

Jun3013 05:27 PM
sophiecentaur

3 
525 
Hello dear PFmembers! :shy:
I'm looking for some appropriate formula which could be utilized to calculate the...

Jun3013 02:15 PM
Gliese123

6 
1,111 
If I put vents on the hood of my car and drove at 60mph what kind of psi could be achieved? I don't care about what...

Jun3013 12:13 AM
Baluncore

4 
830 
I am trying to resolve some long standing problems I have encountered with blackbody radiation. Namely, the derivation...

Jun2913 11:20 PM
klawlor419

2 
658 
As far as I know, Cherenkov radiation occurs when a charged particle travels through a medium at a greater phase...

Jun2913 11:14 PM
jlefevre76

4 
813 
So we all know the Coriolis effect isn't demonstrated in a bathtub or toilet. Are there any videos online of the size...

Jun2913 06:42 PM
Bobbywhy

1 
488 
Hoping someone finds this problem interesting, I'm looking for some ideas on how to solve a real world problem, not a...

Jun2913 06:03 AM
Pigkappa

2 
416 
The vector magnetic potential is given
\vec A=\frac{\mu I}{4\pi}\oint\frac{e^{j\beta R_1}}{R_1}dl'
After a few...

Jun2913 04:31 AM
yungman

6 
490 
If someone is walking across the log (rod) of a bifilar pendulum, how would the period of oscillations be affected if...

Jun2913 02:16 AM
AkumAng3l

0 
941 