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Aug12-14 11:12 PM Simon Bridge 
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Aug14-14 03:46 PM DrDanny 
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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
168 190,049
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 70,370
While I was looking up about free falling chain problem(the question about a chain falling on to a table), I wondered...
Sep21-09 10:40 AM
ernestpworrel
2 1,551
Do all types of light in the radioactive spectrum emit heat? If so, why is infrared the only one associated with heat?
Sep21-09 08:43 AM
pixel01
4 1,355
What is this equation I\gamma=(\GammaN)/D2 It is about Intensity of ray. But I can't find any information about...
Sep21-09 08:05 AM
Rajini
2 1,078
Hello all, we know that photon waves..can be expressed as sine wave (two waves:electric and magnetic field...
Sep21-09 07:38 AM
Rajini
0 933
Is v=f\lambda true in every circumstance? Why?
Sep21-09 07:14 AM
A.T.
1 1,583
Please close/delete, i found the answer to my question.
Sep21-09 05:28 AM
N0b0dy
0 933
As I was studying Comatic aberration, in the definition of coma the word off-axis is used which I couldnot understand....
Sep21-09 03:14 AM
Dadface
5 2,544
I have been trying to find out how to calculate a number of things in a system involving liquid and gas. In the...
Sep20-09 07:59 PM
alxm
7 1,558
I have a question which may be based in a complete misunderstanding of how "color" and our perception of it works in...
Sep20-09 05:53 PM
Bob S
2 1,516
Hello fellow physicists :) I have recently done an experiment and am trying to propagate the uncertainty....
Sep20-09 09:30 AM
f95toli
4 4,690
Hello, I'm new to the forum and joined because I have a question regarding Iron Properties. I'm interested mainly to...
Sep19-09 11:43 PM
Loren Booda
1 1,566
Can an electron travelling near the speed of light knock a proton or neutron out of a nucleus?
Sep19-09 07:29 PM
Bob S
10 1,517
This isn't really a homework question, but rather general interest. I cam across a curious equation the other...
Sep19-09 09:46 AM
Doc Al
7 3,144
Hi, I am looking for someway to calculate the dynamic range (Imax/Imin) of some nano-material (only 1-2 nanometer...
Sep19-09 09:39 AM
chenhon5
0 2,609
Recently I was told that scalars, although magnitude only, can be negative. Does this mean that the magnitude of a...
Sep19-09 07:14 AM
DrGreg
4 27,757
Hi, I'm doing an investigation into the absorbance of UV light by glass of varying thickness (constant density and...
Sep19-09 05:57 AM
N0b0dy
2 10,875
Which definition is more clear and correct ? 1)Any thing that has a measurement is called a physical quantity....
Sep19-09 05:25 AM
Mechdude
6 1,460
This may be of interest to some folks here: http://web.mit.edu/newsoffice/2009/magnetic-gas-0918.html Cheers!
Sep18-09 11:22 PM
billblack
0 966
Hi.. I have a problem with kinematic.. ex: if I stood on a moving object, and I jump, where would I be landing? ...
Sep18-09 09:45 PM
jtbell
1 743
If a planet had a large massive satellite, on a long elliptical orbit, would the planet's rotation slow and speed up...
Sep18-09 05:49 PM
Slorrin
4 4,633
I am building a simple capacitor for experimentation and i have a question, or two. At the moment i am using 30cm x...
Sep18-09 02:32 PM
jalebi
41 4,504
How much air pressure could a human survive in?
Sep18-09 11:34 AM
xxChrisxx
35 37,850
Imagine an object in space with no other forces acting on it. Why is it that if you apply a torque on the object, it...
Sep18-09 02:35 AM
sganesh88
14 1,708
You have a weight on one end of a piece of string and you run that piece of string through a tube, and then on the...
Sep17-09 07:03 PM
rcgldr
5 6,069
Is anybody knows what kind of equipment or lens can be used to change the direction of the polarization of the laser...
Sep17-09 05:26 PM
mikelepore
2 3,574
I have 1000kg of weight (it can be a heavy brick) suspended on a platform which I can lower (say 1 meter) and drive a...
Sep17-09 04:57 PM
russ_watters
3 2,498
please help me with this problem... i'm sure someone on here has put this idea in there head on how perpetual magnetic...
Sep17-09 04:46 PM
russ_watters
6 5,313
I'm reviewing my scattering processes and can't quite pin down the difference between raman and compton... It sounds...
Sep17-09 02:14 PM
lzkelley
3 7,106
I understand and have seen light disperse as it shines through a prism, crysal or other medium; I have seen snells...
Sep17-09 01:59 PM
Doc Al
13 1,656
I wish I could upload a picture or something, but I don't have a scanner! I'm looking at an object moving down a...
Sep17-09 12:49 PM
turin
1 2,051
I am studying inductance. Can the core flux be added to or suppressed by the secondary of a transformer. I have...
Sep17-09 12:41 PM
turin
1 906
Say we have two real fields, R(x,t) and S(x,t), which satisfy the 3-dimensional wave equation. Now let there be an...
Sep17-09 12:35 PM
turin
1 1,033
Because of the mass equivalence of energy, photons are said to have a gravitational field just like matter. Have...
Sep17-09 08:02 AM
jtbell
1 950
Hi, I've been learning about moment and there's a lot of things I don't understand First, in the formula moment = I...
Sep17-09 07:54 AM
Andy Resnick
2 982
Hi, it is well know that the force on a mass point outside to an homogeneous sphere is as the whole sphere's mass is...
Sep17-09 06:14 AM
HallsofIvy
3 1,250
Hi Readers, Can anybody just tell me how much energy really 1MeV will be? Curious to know because seen a lot of...
Sep17-09 04:43 AM
Doc Al
7 7,012
hi all. im doing an experiment thats involvse measureing the speed of sound through fluids at different temperatures...
Sep17-09 03:10 AM
Pheo1986
2 3,642
Does the critical temperature Tc of superconductivity suggest a similar parameter at the juncture between mechanical...
Sep16-09 10:04 PM
Loren Booda
2 1,067
Hello: What are Associated Legendre functions? What are they good for in terms of applications?
Sep16-09 09:37 PM
BCox
2 1,056
Hello Is there a name for the equation that calculates how fast someone has to travel to move forward in time, say...
Sep16-09 06:46 PM
DaleSpam
15 1,197

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