
Before posting anything, please review the Physics Forums Global Guidelines.
Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
47,892 
Hey guys I'm looking for. Some more info on eddies current. I understand how it works but all the examples I see use...

Jul1314 11:06 AM
Ziggey

2 
733 
I want to calculate the field distortion caused by placing a conducting spheroid in a uniform electric field. The...

Jul1314 04:42 AM
Shyan

2 
721 
I am working with a single mode fiber at 830 nm with a NA of 0.12...

Jul1314 12:10 AM
rigetFrog

1 
911 
How is electromagnetism different from gravity in that accelerated objects radiate EM waves when accelerated in an...

Jul1214 05:39 PM
WannabeNewton

8 
1,113 
this is a homework problem i realized after posting it. so could a moderator please move this question to the hw...

Jul1214 04:54 PM
UltrafastPED

1 
684 
This is related to classical Hamiltonian mechanics. There is something wrong
in the following argument but I cannot...

Jul1214 05:46 AM
Matterwave

1 
798 
What are your opinions about these two experiments described at: http://adsind.wordpress.com? Can they be used to...

Jul1114 01:45 PM
micromass

5 
828 
I am trying to understand why I can specify the specific volume v of a fluid element as a function of the equilibrium...

Jul1114 12:34 PM
WannabeNewton

3 
847 
This is a problem I thought up. If I'm correct as far as I've gone, the answer is rather surprising.
A thin but...

Jul1114 12:26 PM
MrAnchovy

16 
1,772 
I understand that when an electron is excited it goes to a higher energy level and then relaxes to ground state...

Jul1114 11:57 AM
Bandersnatch

1 
646 
Hello,
Been a while since I posted on here, nice to be back :) .
I just want some pointers as to the methodology...

Jul1114 08:45 AM
Mech King

3 
948 
I have come to learn that the Doppler shift equation is asymmetric. That is, the Doppler shift is not the same when...

Jul1114 07:47 AM
user3

7 
777 
We know that the main use of capacitor is to store charge in the form of electric field,and we want it to store as...

Jul1114 01:44 AM
phoenixXL

1 
669 
I feel I understand what happens, and how to solve the equation of motion x(t) for a mass attached to a spring and...

Jul1014 06:19 PM
Edge Of Pain

7 
933 
The power density of an electromagnetic wave is proportional to the absolute square of the electric field E^2...

Jul914 09:05 PM
Andy Resnick

2 
1,590 
Please help me qualitatively in the following points :
1) If in a system(consider a cylinder) fixed with a piston ,...

Jul914 11:14 AM
Philip Wood

2 
908 
hai friends,
i would like to know what would happen to three isolated point separated by infinite...

Jul914 09:39 AM
jbriggs444

1 
867 
Hi,
I have a question I'd like some help with which is related to my job working with drill rigs.
Where you have...

Jul914 07:43 AM
256bits

6 
1,130 
Why do we take Θ=90° for calculation of potential energy

Jul914 06:11 AM
physicsjn

1 
905 
Hello!
It has been years since I had physics at uni, and I have forgotten lots of it, so I need some help here. The...

Jul814 01:20 PM
homeowner

0 
801 
I know that in the vector potential formulation one can use a scalar Green function (to find the said potential and...

Jul814 12:50 PM
Apollo2010

3 
1,287 
Hi guys,
I hope this is the correct section otherwise I apologize :).The goal is to find the capacity of a non linear...

Jul814 10:15 AM
rinale84

6 
849 
I'm looking to find the resultant force of three forces and a moment: Fx, Fy, Fz, and Mx. I intend to graph multiple...

Jul814 06:07 AM
Smijo

2 
976 
Hi all,
I am looking into induced electric fields by changing B fields inside layers of dielectric. For example, if...

Jul814 05:13 AM
vanhees71

10 
1,278 
I tried to make the title as descriptive as I could without being overly long.
Anyway, I've been trying to work...

Jul714 11:12 PM
elegysix

6 
2,280 
Hello.
I have a question about experiment. You know it. You need beer bottle, water and ping pong ball.
You...

Jul714 10:56 PM
elegysix

1 
786 
Are these two, wave number and wave mode, same thing?
If not, what is the difference?
Thanks...

Jul714 09:00 PM
Simon Bridge

10 
1,426 
Hi
I'm trying to model the drag effects in using Lagrange Mechanics and trying to include the effects of...

Jul714 04:45 PM
rigetFrog

1 
1,286 
Hello Physics Forums
I need a little help wrapping my head around the concept of lambertian emitters as compared to...

Jul714 04:41 PM
rigetFrog

1 
920 
Finding the magnetic field for a straight wire using the right hand rule shows that the field is around the wire.
...

Jul714 02:15 PM
UltrafastPED

1 
738 
Greetings,
I have two semirelated questions.
1. When making the Lagrangian formalism of electrodynamics, why is...

Jul714 01:33 PM
HJ Farnsworth

2 
924 
Does a point charge 'q' (say an electron) moving with constant angular speed ω in a circle of radius R constitute a...

Jul714 12:54 PM
Vanadium 50

17 
1,201 
I have a Fresnel lens which is equalant to a Plano Convex lens, Consider object on one side and my eye is on the...

Jul714 07:11 AM
UltrafastPED

3 
364 
So a cube submerged in water will experience pressure on all six sides, and the pressure on the bottom will be greater...

Jul714 06:51 AM
DaleSpam

8 
784 
i was told that progressive waves has no nodes, why is it so? can anyone here explain please?

Jul714 04:30 AM
Simon Bridge

1 
283 
If I hold the top end of a straw filled with water, the water stays in the straw which is due to the atmospheric...

Jul714 12:56 AM
Simon Bridge

3 
409 
Hi guys. I hope this isn't a bad place to post my question, which is:
I'm reading some lecture notes on Lagrangian...

Jul614 10:38 PM
Travis091

4 
480 
So the formula is F=Gm1m2/r^2. Could you substitute one of the mass values for an energy value since gravity attracts...

Jul614 09:32 PM
MrR

6 
449 
Hey guys, I don't know if here is the right section for this question but anyway. So I was looking for the proof or...

Jul614 08:54 PM
UltrafastPED

1 
494 
I am facing difficulty in understanding a key point . Hence I am putting it here instead of Introductory Physics...

Jul614 12:32 PM
Delta²

11 
1,473 