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

Apr2211 05:26 AM
ZapperZ

1 
46,903 
I've been trying to figure this out for long now but unfortunally, I'm not able to prove that ∇E = 0 in an Ohmic, 2d...

Apr3013 06:46 AM
ManDay

0 
486 
The equation for the change in momentum for total absorption of electromagnetic radiation is ΔU/c and that for total...

Apr2113 01:07 AM
virtuosowanaB

2 
417 
Why change of magnetic flux with the time through a coil induces current in it?
Please tell me that what happen to...

May2914 05:01 AM
siddharth5129

5 
273 
To every scalar field s(x,y) there corresponds a 'constant' vector field x = A s(x,y) and y = B s(x,y), where A,B are...

May1414 01:16 PM
UltrafastPED

6 
198 
Hello there,
I was not sure if this belonged in the Classical Physics forum or the General Physics forum, so my...

Apr1512 11:11 AM
Ken G

2 
1,022 
Hello PF. I thought this would be a good place to ask around for information pertaining to "where we are at" in...

May2612 03:05 PM
Inve

2 
1,012 
I want to build a metal wood stove that has much higher thermal conductivity than steel.
I want to find a metal/alloy...

Jan1109 11:06 PM
blackfish

0 
1,494 
Does anyone know how either Lienard or Wiechert justified the (1v/c) factor that appears in their potential formula...

Sep1609 03:05 PM
clem

3 
972 
I'm confused with this topic. However, I think I know a bit. There's something to do with the temperature and it...

Nov2812 01:14 AM
K^2

19 
2,924 
I have (conceptual) questions about this question posted before:
...

Feb1112 02:16 PM
Naty1

1 
1,314 
Hello, just been reading a little bit about the basics of moving coil meter and one thing is bugging me.
First if...

Mar2813 04:25 AM
Siune

0 
974 
Hello everyone,
In order to define the eulerian rate deformation tensor, one should first express...

Jun2314 04:29 AM
trabo

4 
293 
I am taking a statictical mechanics course, and one thing bothers me. I am not sure when we should use the normal...

Dec304 03:22 AM
Galileo

1 
2,455 
Does anyone have any tips on how to properly determine the degrees of freedom in simple mechanical systems? I've done...

Apr2211 01:22 PM
Lavabug

0 
1,425 
Does anyone knows how to explain (both physics and mathematics) why there's no magnetic monopole?

Mar3009 02:15 PM
Naty1

8 
986 
In the chapter on radiation (Chapter 11), Griffiths notes that an electric monopole does not radiate, but also that a...

Dec1507 06:14 AM
Shooting Star

1 
1,159 
Hello all,
I'd like to calculate the inductance of a straight current carrying wire per unit length of wire.
The...

Jan1411 03:59 AM
Phrak

10 
4,821 
I'm only interested in the 2d representation of this, as I will be applying whatever I learn to a physics engine
...

Jun2811 02:07 AM
trogdor458

0 
794 
Why Do I Use U For Constant Volume and H For Constant Pressure?
Also, which can be calculated H, Q, U, W?

Oct3011 10:27 AM
I like Serena

3 
3,215 
Hi all, I've read the last capters of Arnold's "mathematical methods of classic mechanics" (so I know the basic facts...

Oct1409 06:05 PM
Andrea85

0 
943 
I'm looking for a good example for a freshman mechanics class to demonstrate how one can integrate the equations of...

Apr111 10:49 AM
bcrowell

10 
2,932 
>> can anyone tel y friction is independant of surface area/length ......
thx an regards,
arun

Feb2707 11:31 AM
arildno

5 
4,440 
http://physics.ucsd.edu/students/courses/summer2009/session1/managed/session1/physics1a/documents/Ch5_solutions.pdf
...

Mar514 11:57 AM
bigfooted

3 
276 
wrong form sorry.

Oct609 09:14 PM
ph351

0 
745 
Is there a theoretical maximum entorpy? I just read on Wikipedia that there are certain conditions in which the...

Jul1504 05:02 AM
MiGUi

4 
1,221 
Dear all,
Me and my friends are arguing how many significant figures does 0.0 and 0.0000 have?
Me and my other...

Sep2612 06:38 AM
jbriggs444

14 
2,987 
How far do you need to separate two opposite 1C charges inorder for the potential difference to be 1v?

Feb1710 02:33 AM
Born2bwire

1 
765 
1) If we charge a stacked capacitor like the one in the picture and then remove the leads (red and blue) what will be...

Sep2211 04:53 PM
Philip Wood

3 
945 
1this is what is written in my book:
E= Ir+E' where E' is the back emf, r and E' are constants
P(mechanical)=E'*I...

Mar3011 09:46 AM
asdofindia

3 
641 
I am having a problem understanding the mathematical reasoning of finding the description of image in convex mirror......

Aug2212 03:50 AM
Ezio3.1415

10 
1,969 
(ok i not sure where this topic goes so ill take a guess its here)
ok, I hear that nothing is 100% efficienct. some...

Feb2607 02:18 PM
KingNothing

8 
5,107 
Is there ANY way for ANY type of energy to be transformed from one form to another with no losses, a perfect 100%...

Sep1110 03:44 PM
Bob S

11 
4,866 
http://www.youtube.com/watch?v=69EzdOHHXc
A 100g weight resting on a scale took a ride in a lift. From the...

Jul2412 09:27 AM
pikachoo

8 
1,073 
Does anyone know the significance of 1233 degrees Kelvin?

Nov1307 04:18 PM
stewartcs

1 
1,032 
Imagine you have a regular 13 sided polygon with charges distributed on every corner of the polygon.
What would a...

Sep812 09:32 AM
sentinel

5 
1,191 
I used the formula here:
http://en.wikipedia.org/wiki/Magnet#Force_between_two_bar_magnets
The values came from an...

Jan609 11:15 PM
heliotrope

18 
6,445 
I was just reading my book when it said that the fact that newtons rings were always dark in the center where the lens...

Jan410 03:05 PM
MrFrankie

8 
4,520 
anyone have the solutions to the 1995 free response for physics C ap test? I have most of it done, but i just want to...

Mar1009 05:25 PM
cristo

1 
8,749 
Hi All,
Can someone please point me towards an introductory text of internal resonances (like the 1:1 and 1:2) they...

Sep2710 06:45 AM
thrillhouse86

0 
590 
So I was sitting on the train last weekend, reading through my physics book on mechanical work and its relation to...

Oct311 04:05 PM
Ken G

1 
1,311 