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Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
47,867 
Hello everyone!
I was reading the following review:
...

Jun1514 08:47 PM
586

6 
536 
The derivation of Planck's law in my textbook begins with the assumption that the energy of an oscillator with...

Jun1514 07:33 PM
Andrew Mason

1 
219 
Hi,
The focal length of the PlanoConvex lens as calculated by the lens maker equation: Does it work when light...

Jun1514 04:18 PM
bgq

2 
277 
I'm having trouble with this line from Goldstein"the center of mass moves as if the total external force were acting...

Jun1414 08:51 PM
AlephZero

4 
285 
Hello friends,
Referring to the attachment it can be clearly understood that flow work in an open...

Jun1414 07:07 PM
Chestermiller

5 
348 
1st) Can you think in the reciprocal of the memristance? Can you give me a theoretical definition (or just a notion)...

Jun1414 06:52 PM
nsaspook

2 
243 
See: http://en.wikipedia.org/wiki/Y%CE%94_transform#Basic_Y.CE.94_transformation
Is possible to express the...

Jun1414 05:34 PM
Greg Bernhardt

1 
228 
I'm having trouble getting my head around entropy. In an isolated system, entropy can only remain the same or...

Jun1414 01:23 PM
nearlynothing

2 
260 
According to wikipedia, "The moving magnet and conductor problem", I stopped at the equation shown in the attachment....

Jun1414 09:50 AM
adelmakram

5 
270 
We know that for constant pressure thermodynamic processes which only expansion work is possible, dH=dQp. My question...

Jun1314 08:50 AM
Andrew Mason

12 
398 
It is well known that the evolution of the input reflection coefficient, ρ, of a LTI causal passive system with...

Jun1314 02:17 AM
WhiteHaired

4 
560 
I know what is circulation by a mathematical point of view, but in the reality (in the physical world), what is...

Jun1214 10:54 PM
Jhenrique

8 
557 
Why others vector fields no are studied like the magnetic and electric fields? In other words, why others vector...

Jun1214 10:37 PM
Jhenrique

5 
237 
How do you write out the potential of an ion in a Penning trap? Specifically, how does the interionic Coulomb...

Jun1214 08:02 PM
rigetFrog

1 
242 
I don't know how to integrate the MaxwellBoltzmann distribution without approximation or help from Maple.
Given...

Jun1214 02:23 PM
TeslaPow

11 
389 
Hi everyone,
If you have a horizontal circular motion (with gravity action on the object), what holds the object up...

Jun1214 08:09 AM
ramanakumars

5 
276 
For an infinite plane sheet of charge it is obvious that the Efield points directly perpendicular to the sheet. but...

Jun1214 07:17 AM
vanhees71

3 
264 
Is it to identify something (not necessarily very accurately but at all) with sound? Also, i know its possible with...

Jun1114 11:48 PM
dauto

11 
291 
There is a book with very briefly theory, showing the essentials for make the exercices of electrodynamics, and also...

Jun1114 08:34 PM
UltrafastPED

1 
204 
Hello,
Can someone explain what's going on in equations 196 and 197:...

Jun1114 08:12 PM
pierce15

4 
230 
When a circuit is being alimented by AC this means that exist in the circuit a voltage source that is generating the...

Jun1114 06:57 PM
Jhenrique

6 
286 
Hello everyone, it's been a while since I've been introduced to Newton's laws for the first time. Yesterday I've been...

Jun1114 12:16 PM
stevendaryl

33 
1,153 
I'm trying solve this scheme:
http://www.physicsforums.com/attachment.php?attachmentid=70441&stc=1&d=1402248289
...

Jun1114 08:44 AM
Born2bwire

7 
287 
This is not a homework question.
Whilst looking over at previous exam papers on classical physics, I came across...

Jun1114 04:44 AM
Adithyan

3 
205 
So, I'm trying to study phase shift in an unbalanced rotating system (where "phase shift" means the resulting response...

Jun1014 10:21 PM
diffusegrey

4 
293 
When a object of mass non insignificant is traveling in space and is sob influence of one gravitational field, the...

Jun1014 07:08 PM
UltrafastPED

1 
195 
Hello.
I've got a question.
If we've got a fourietransformation of charged particle field, ...

Jun1014 03:11 PM
sukharef

0 
156 
As we all know, if a car happens to be struck by lightning its passengers will probably be safe. The usual explanation...

Jun1014 11:27 AM
D H

15 
484 
This question is a variation on another question I asked recently.
Suppose you were in a box made from a perfectly...

Jun1014 04:25 AM
Drakkith

13 
344 
Is possible to associate voltage sources and current sources by a delta scheme or by star scheme?

Jun1014 03:44 AM
Jhenrique

0 
178 
Question:
A block of mass 10 kg moving with a velocity of 1 m/s collides with a spring of force constant 1000 N/m....

Jun1014 03:01 AM
Jilang

17 
423 
I'll assume that we all know of 1st, 2nd and 3rd Class Levers.
Years ago I saw a brief remark in a magazine that I...

Jun914 11:53 PM
Saxon Violence

2 
216 
I have read that in a charged conductor, all the charge is located at the surface of the conductor and the Electric...

Jun914 11:22 PM
hamza201195

3 
204 
When:
 Vacuum had an absolute mass, relatively limiting expension of all universal matter
 Newton's second law...

Jun914 06:03 PM
micromass

3 
223 
Hi,
My question is how do do laser interferometers measure distances of more than one wavelength?
I know they rely...

Jun914 02:00 PM
Andy Resnick

2 
194 
Hi all,
Here is the derivation of kinetic energy from Work:
W = ∫Fds
From the second law of motion F =...

Jun914 01:32 PM
UltrafastPED

5 
343 
The equation for this physical model is:
http://upload.wikimedia.org/wikipedia/commons/f/fb/RLC_series_circuit_v1.svg...

Jun914 09:24 AM
Born2bwire

1 
217 
I'm developing a classical model of a dipolar ion in an external electric field. It consists of two charges...

Jun914 09:21 AM
DrClaude

2 
244 
How would be the 2nd Kirchhoff's law for this circuit here:
...

Jun914 08:25 AM
CWatters

8 
284 
If in a typical complete circuit (RLC) we have a resistor with resistence R, an inductor with inductance L and a...

Jun914 08:00 AM
Simon Bridge

18 
443 