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Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
47,841 
Hi All,
This is part solution, part request for peer review.
I wasn't able to find a model for the motion of a...

Aug313 07:31 AM
mfb

3 
861 
for RF, how does this mechanism work?
http://i.imgur.com/Crx4Amx.png
how does the conductor do this? and why...

Jul3113 10:45 AM
Enigman

9 
853 
Rusty on the math...
I am working on a problem and need the derivation of a free fall trajectory for an object at...

Jul2913 03:06 PM
Creator

8 
695 
I've been told (since high school I think) that "view angle" in a 2dimensional plane is approximately (distance to...

Jul2913 08:03 AM
Andy Resnick

6 
1,370 
The potential due to a polorized distribution is given by:
V( \vec{r}) = \frac{1}{4 \pi \epsilon _{0}} \int _{V}...

Jul2913 03:45 PM
DrDu

20 
1,021 
In this video at 7:15 you see a rifle fired underwater:
cp5gdUHFGIQ
Apparently even before the bullet leaves the...

Jul3113 10:07 AM
A.T.

20 
1,506 
I am not sure I get the concept of centrifugal force..
If we have a stone tied to a thread and we just spin it in a...

Jul3013 12:03 AM
DaleSpam

35 
2,098 
How to find the linear dispersion of a Direct Vision Prism with given parameters?

Jul2913 10:46 PM
itsnaresh

0 
338 
Hi guys,
After reading a paper about electron scattering, I became very interested. So if an electron is...

Jul3013 10:02 PM
Simon Bridge

6 
599 
Hi All!
I've been doing some research in an attempt to uncover the proportionality between usable traction, which is...

Jul2913 06:08 PM
tduell

2 
518 
Hello everybody!
I read that if one of the two materials involved in Snell's law is a conductor, the refraction angle...

Jul3113 05:41 AM
EmilyRuck

10 
908 
Does any body here have any information about gravitational vortex power plant..?

Jul3113 11:22 AM
Drakkith

7 
749 
Good afternoon all
My question is, when we observe stationary waves, and we know that at a certain point, the sound...

Jul2913 03:58 AM
Bobbywhy

1 
647 
How exactly would you describe the principle of a valve for flow control?
In a globe valve for example the fluid...

Jul3013 04:28 AM
gmax137

5 
749 
Hi all,
I notice the patterns such as v = 0.5at^2 and PE(spring)=0.5kx^2, etc...but, all examples I have seen show...

Jul2913 10:08 PM
PhanthomJay

4 
453 
I think everybody here knows the equation that gives the potential of a point like dipole, but how does the field look...

Jul3013 02:03 AM
DrDu

1 
385 
What's the difference between cold moving air and hot moving air?
For instance, suppose you put two fans, of the...

Aug113 11:18 AM
russ_watters

11 
959 
Hi All,
I'm having a bit of trouble remember basic physics and hoping someone can help If i've got the wrong...

Jul2913 08:50 PM
basil4j

0 
387 
Batters swear that batting gloves improve their performance. From a physics standpoint, why is this?
My impression...

Jul2913 10:09 PM
Simon Bridge

1 
349 
Hi PhysicsForums.
I have a question. I was looking through a manual for an industrial grade PC, which is fanless,...

Jul3013 02:31 AM
256bits

2 
417 
http://en.wikipedia.org/wiki/Gradient#Cylindrical_and_spherical_coordinates
which formula do we apply to get the...

Jul3113 06:37 AM
igorronaldo

4 
537 
The following are Maxwell's Relations right?
\left(\frac{\partial s}{\partial v}\right)_{T} = \left(\frac{\partial...

Jul3013 09:15 AM
jtbell

1 
419 
I am trying to study the motion of a falling body in the earth’s gravitational field however not assuming a constant...

Jul3113 02:43 AM
rcgldr

10 
542 
Hello forum.
I am finding it hard to wrap my mind around the concept of power when considering forces. We can...

Jul3113 11:29 AM
Drakkith

3 
674 
So, I was wondering if a conducting loop was placed in orbit around the Earth would it be able to generate a current?

Jul3013 10:24 PM
Simon Bridge

1 
777 
Hi all,
Any ideas how to solve this integral?
$$ \int_{0}^{\pi}...

Jul3013 08:18 PM
klawlor419

2 
490 
I am a little confused about the MerminWagner theorem, and the assumptions it makes, and I would like to better...

Aug313 08:54 PM
king vitamin

4 
1,138 
Trying to get my head around something with the Darcy Weisbach. It is used to calculate the head loss of a moving...

Jul3113 06:57 PM
SteamKing

1 
552 
Good evening,
I've been trying to wrap my head around this problem for some time and I just can't seem to get it...

Aug213 07:41 AM
MrsTMouse

7 
948 
Hi all,
I have a simple circuit with a battery, resistor, and finally, the capacitor.
Am I correct in saying...

Aug113 03:11 PM
technician

3 
896 
Please watch 05:00 to 08:00
http://www.youtube.com/watch?v=jbmFcGhTnS0
Force = Mass x Acceleration
So for...

Aug113 08:13 AM
DaleSpam

30 
1,853 
I'm curious what models there are for calculating the Electric Susceptibility in crystalline solids and any books that...

Aug113 01:56 AM
DrDu

1 
531 
Newton's law of universal gravitation states that every point mass in the universe attracts every other point mass...

Aug313 06:36 AM
technician

14 
1,604 
Hi,
After reading several resources about work and energy, I am confused about the conditions that should be...

Aug113 05:33 PM
Jano L.

1 
796 
I am wondering about why the electric field in a hollow sphere with charges on its surface would be zero.
I have...

Aug413 12:43 AM
triphenylamine

13 
1,749 
So at my gym, there's a cable machine that works like this: You pull on one cable and you lift x mass using y force. ...

Aug213 04:56 AM
A.T.

1 
642 
When a positive point charge q is brought close to a neutral conducting spherical shell then negative charges will be...

Aug313 10:59 AM
vanhees71

4 
518 
I have a project to build a well insulated cylindrical vessel approx 220 cm in diameter and 125 cm in depth. Like a...

Aug313 01:39 AM
Terry998

0 
424 
I have so far encountered the notion 'state' in classical mechanics, thermodynamics and quantum mechanics. I have,...

Aug313 04:36 PM
Jolb

1 
318 
Hi
does anybody here know whether there already exists a theory that describe Mie scattering for spheres that have...

Aug313 06:07 PM
mfb

5 
386 