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

Apr2211 05:26 AM
ZapperZ

1 
45,988 
I am reading Introduction to Mechanics by Kleppner and Kolenkow. I am now reading the articles dealing with...

Dec1707 11:27 AM
arildno

5 
2,829 
Please see this link first: http://en.wikipedia.org/wiki/Precession#Classical_.28Newtonian.29
How do they get to...

Dec1607 06:27 PM
JolleJ

10 
4,266 
having problems trying to understand and derive the equation for intensity in the doubleslit interference pattern. ...

Dec1607 05:28 AM
St_LightStorm

42 
4,447 
My teacher asked us too prove that Hamiltons principle proves that newtons equations of motion hold for N particles....

Dec1607 12:00 AM
frenchyc

4 
2,009 
Voltage = Current * Resistance
Power = Current^2 * Resistance
Magnetic field magnitude of a solenoid = magnetic...

Dec1507 06:39 PM
DaleSpam

5 
3,013 
I conjecture that only spherical symmetric mass distribution can produce radial gravitational force field (according...

Dec1507 04:22 PM
mma

11 
3,124 
Bulb with volume of 5 liters is filled with nitrogen n = 3 molls. The bulb is set in space, the bulb cracks and the...

Dec1507 12:10 PM
Privalov

25 
2,070 
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 
1,158 
Hi all,
If we take the integral of tau (the resultant torque) times the angular displacement theta, with respect to...

Dec1407 09:17 PM
Shooting Star

18 
2,526 
Let's say we have a sphere, radius R, which has a uniform volume charge density. Then we wrap it around with a...

Dec1407 03:28 PM
mda

2 
1,416 
Is it possible that the the small vibrational energies that make up "heat", are caused by the pull of electrons...

Dec1407 02:57 PM
Ben Niehoff

8 
1,126 
We have a springmass system which oscillates in one dimension on a frictionless horizontal surface. We act an...

Dec1407 09:40 AM
olga11

6 
5,585 
Hi all,
I would like to know in which circunstances the third law applies just in the weak form.
Thank you
...

Dec1307 11:09 PM
Shooting Star

6 
1,396 
I have been trying to find the explaination why the wavelength of a wave is the limit of the resolution of an image...

Dec1307 05:42 PM
Claude Bile

1 
10,177 
Light in a vacuum has momentum \hbar k but when the light enters a dielectric medium, fx. glass, the momentum of the...

Dec1307 02:32 PM
clem

2 
2,202 
Hello,
Is it always true that (EB) = 0 ?
If the answer is "no". In which cases is it true ?
Thank you !

Dec1307 01:10 PM
DaTario

1 
995 
As I understand it, conductors interact with EM waves (light) in such a way that
prevents transmission through the...

Dec1307 09:24 AM
silverrose

8 
2,652 
I went for a run and measured time and distance. I wanted to estimate how many calories I used.
Suppose a ran a...

Dec1307 07:17 AM
Shooting Star

1 
2,530 
i found this in a text book.
at a high altitude the temperature of the atmosphere is 500 degrees centigrade. yet an...

Dec1207 06:56 PM
russ_watters

4 
2,276 
Hello, can someone please help me out here, i want to step up the voltage of a 1.5V battery to 300V, i know that to do...

Dec1207 03:53 PM
alvaros

1 
1,770 
we define mech equivalent of heat as the amount of work done in joules in order to provide 1 cal of energy.
4.2 J= 1...

Dec1207 03:43 PM
alvaros

5 
2,616 
Dear all,
For my Ph.D research. I have to use the material derivative concept. I reviewed some of my previous...

Dec1207 11:00 AM
momentum_waves

1 
8,954 
If I have some arbitrary Thermodynamic system, and I want to find the equilibrium state what do I do?
Lets say that...

Dec1107 08:58 AM
Count Iblis

8 
2,244 
I have two short questions:
1) Is the Carnot cycle completely reversible?
2) \Delta S = 0 for a reversible...

Dec1007 05:29 PM
vivesdn

1 
3,996 
can static friction do work?

Dec1007 02:12 PM
arildno

39 
4,864 
Let's say we have a battery of with a given electrical capacity and we are trying to maximize the work being done with...

Dec1007 01:29 PM
kmarinas86

10 
3,029 
If I put a single cycle of an oscillating electric field (from zero crossing point to zero crossing point) into a...

Dec1007 07:03 AM
tfoale

0 
1,539 
I was asked to design a worksheet and demo setup illustrating the physics of a differential switch (high school to...

Dec1007 02:24 AM
wizzart

0 
1,933 
does the temperature of a body depend upon the frame of reference from which it is observed?

Dec907 07:54 PM
TVP45

15 
2,536 
newton's first law states that a body in motion tends to stay in motion and that's why when you're driving a car and...

Dec907 02:09 PM
russ_watters

6 
2,183 
Hi,
I have for me a complex question! :(
If I get to Mt. Everest (let's say  highest place on Earth), then...

Dec907 10:14 AM
tkojemile

2 
1,001 
The entropy of a system is
S = k*ln W
If we obtain some information about the microstates, e.g. know the location...

Dec907 09:35 AM
LTP

4 
1,805 
when some molecules in a liquid gain enough energy to overcome attractive forces by surrounding molecules, they escape...

Dec907 08:25 AM
Doc Al

1 
1,727 
hi everybody
my question is:
a spherical shell is heated. the volume changes according to the equation...

Dec907 07:49 AM
Doc Al

4 
2,864 
Hi,
I'm trying to create a simple pool game. The ball is moving with speed vx along x axis and vy along y axis. This...

Dec907 05:54 AM
pmbasa

9 
2,360 
i used the formula for KE rotation KE=(1/2)Iw^2 and i translated it to (1/2) v^2/r^2, but i wanted to know what does...

Dec807 03:01 PM
Doc Al

3 
1,081 
I have read in several places that superconducting materials are the closest phenomenon to perpetual motion known to...

Dec807 09:55 AM
Advait

19 
4,681 
I am doing this project to check how the number of baldes of a turbine affects its output. So I used a D.C motor which...

Dec807 09:52 AM
Advait

9 
3,644 
Hello:
I am trying to figure out a way to calculate the number of calories burnt running. Before I do on to explain...

Dec707 06:16 PM
f95toli

6 
5,358 
I am trying discuss steak preparation with another person and an issue has arisen. I do not have time to perform this...

Dec707 05:19 PM
cmpalmer

10 
2,000 