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Quality answers to common physics questions
May25-09 10:31 AM ZapperZ 
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Jan16-12 Greg Bernhardt
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
May6-14 04:32 AM
Cthugha
168 176,997
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 67,742
I have a general question. Is an increase in potential energy always associated with the decrease of the speed...
Mar26-13 11:45 AM
mfb
1 432
It is generally well known that the elastic modulus of most materials become larger with decreasing size. This could...
Mar26-13 09:07 AM
CWatters
1 690
Hello, I was reading the article given in this link http://www2.ignatius.edu/faculty/decarlo/kirchhoff.htm, of...
Mar26-13 03:28 AM
sophiecentaur
38 2,754
Hey guys, I'm not sure how to interpret euler's fluid equations \rho (\partial / \partial t + {\bf U} \cdot ∇)...
Mar26-13 02:16 AM
tiny-tim
1 469
Hi, I'm trying to come up with some examples of ODEs (not PDES) in physics that are unsolvable analytically, and for...
Mar26-13 12:27 AM
SteamKing
1 619
Robert Braeunig has an great blog on rocket science here: http://www.braeunig.us/space/index.htm, and I've been trying...
Mar25-13 11:01 PM
Simon Bridge
3 495
I have a problem involving the rotational version of Newton's Second Law. A spool is resting on a tabletop. A wire is...
Mar25-13 06:47 PM
rcgldr
2 739
Hi, I am a Norwegian student and have a practical question. I am sorry about my English. My iPad keeps autocorrecting...
Mar25-13 11:55 AM
mfb
8 966
If two capacitors are connected in parallel to a battery and then the battery is removed, what happens to the charge...
Mar25-13 11:08 AM
collectedsoul
20 1,169
http://upload.wikimedia.org/math/0/f/3/0f36df929ac9d711a8ba8c5658c3bfee.png I don't really understand this formula...
Mar25-13 08:12 AM
Lsos
7 644
For a magnetic fields lab I am asked to graph the data and from there, use the slope to find a certain value. For...
Mar25-13 04:26 AM
mfb
7 3,816
Hello ! I'm going to use thin ( 0.004" ) sheet of Permalloy-80 to realize a magnetic shield ( against european 50 Hz...
Mar25-13 02:22 AM
Ravaner
3 599
I've been teaching myself some thermodynamics, and I've been thinking about solving the heat equation. ...
Mar24-13 08:55 PM
Chestermiller
3 727
Lasers are known to emit a particular wavelength, and with a bandwith that is extremely narrow. I have been told that...
Mar24-13 08:50 PM
marcusl
4 649
Everything radiates. Then when we accelerate an electron (in the experiment of diffraction of electron to prove...
Mar24-13 06:17 PM
Outrageous
16 1,232
Hi, First of all, I am an undergraduate Chemistry student, but who is also very interested in various areas of...
Mar24-13 04:35 PM
Chestermiller
2 870
Does the spring constant of a piece of rubber affect its rate of cooling constant 'k' ? 1) Is there any formula,...
Mar24-13 03:38 PM
AlephZero
4 572
I have a question about coherent light in anti-phase, I'm probably thinking about this wrong but I just cant...
Mar24-13 01:27 PM
sophiecentaur
10 879
Hi All, I need help determining focal length value in a two lens system. In the set up, the light source (object)...
Mar24-13 01:18 PM
Andy Resnick
1 524
I am calculating the time it takes for an object to fall 90 about an axis of rotation in the x-y plane. I have...
Mar24-13 09:47 AM
mfb
7 879
I am in my senior year of school and I have been given a research task to do on the Earth's magnetic field in a given...
Mar24-13 08:21 AM
BobG
11 1,609
Hi, I am trying to derive the compton effect formula. I am not very good at physics, however, I am trying to get...
Mar24-13 07:49 AM
ZapperZ
5 821
Hi there everyone, Would like some checking of my work or comments. Would like the work done on a falling mass M...
Mar24-13 05:54 AM
sophiecentaur
11 1,126
Dont give me the answer that its because of surface tension. I want it in detail.
Mar24-13 05:46 AM
sophiecentaur
7 859
The title pretty much says it all, but let me elaborate on the source of confusion. VIM defines quantity as: ...
Mar23-13 09:27 PM
DaleSpam
7 624
This problem is making me want to tear my hair off. I am trying to calculate the time it takes for a beam to fall to...
Mar23-13 07:33 PM
Ryoko
2 908
why the pulse is positively chirped pulse in picture 20130320182307.png ? thank you!! I also confused by another...
Mar23-13 06:07 PM
dmriser
8 1,166
in what situations would you require the use of the parallel axis theorem? Also, from the physics book it says that...
Mar23-13 03:42 PM
HS-Scientist
1 582
The angular speed of precession for a gyroscope is given by ω_{p} = T/ω_{g}. So that the rate of precession...
Mar23-13 09:50 AM
pumila
6 1,139
I am an electrical engineer disabled in a snow sking accident and am now a quadriplegic. I'd like to design an...
Mar23-13 09:30 AM
mfb
9 1,078
When a magnet has a value of.. lets say 10 Tesla, what does this mean exactly? Does this mean the magnetic field value...
Mar23-13 09:15 AM
mfb
6 747
Is it possible to use the stress-strain diagram from a stress test, to determine at which point an object would be...
Mar23-13 09:08 AM
risecolt
0 624
In our formulation of work done by a Force we say it is ∫ F.dl ... My knowledge of integration means adding...
Mar23-13 08:33 AM
Doc Al
6 510
hello , I am trying to detect a laser pulse with a photodiode , having a power of 100w max of the laser beam with...
Mar23-13 08:27 AM
Redbelly98
15 1,525
The question is quite simple where in the universe I would be completely at rest. Not moving at all. I ask the...
Mar22-13 08:57 PM
carlgrace
5 735
Can someone tell me how a moving coil meter is converted into an ohmmeter? I have been searching for relevant...
Mar22-13 06:59 PM
Bobbywhy
1 613
I cannot figure out focal distance and the like, is there anyway I can get a walkthrough? the radius of curvature (R)...
Mar22-13 06:46 PM
tiny-tim
1 441
For example if a hat is lined with nickel, silver, EMF paint, etc. , then how do you ensure the hat is grounded? I...
Mar22-13 06:26 PM
Drakkith
9 1,787
In some questions I am doing, you set of a pair of simultaneous equations and in the notes we have that . For a non...
Mar22-13 03:32 PM
t100ss
2 441
I read in Feynman's book that it is not possible to see objects less that wavelength of visible light with a...
Mar22-13 01:37 PM
Emilyjoint
5 2,089

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