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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
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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
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Hello, my name is Stefan and I am a twelfth grade high school student working on an extracurricular project which I...
Feb23-12 06:29 PM
Drakkith
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I've been having trouble visualizing 4D objects(4 physical dimensions, excluding time), in fact I cant seem to be able...
Feb22-12 09:23 PM
James_Harford
12 2,827
what do we mean exactly by visible light? Since light is oscillating electric and magnetic fields, and both electric...
Feb23-12 03:36 AM
Johninch
20 3,508
This is why I think this is the case, I can't come up with any other reason and have been researching all over the...
Feb21-12 06:35 PM
glenn21
21 2,181
As we know that conductivity of semicondutors can be increased or decreased by supplying heat or photons to the...
Feb22-12 07:58 AM
lazyaditya
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Hi, I want to compute the wave filed from a point source, which is called Green's function or point spread...
Feb21-12 08:37 PM
huangchao
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what does torque of 5 kg.cm meant by for a dc geared motor? can I give a load upto 5 kg for that motor? If so what are...
Feb22-12 12:18 AM
dexterdev
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According to my physics textbook, one can find out the direction of a magnetic field by a small magnet. The magnet...
Feb21-12 09:48 PM
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Am I right in thinking the chip controlling the LED is applying more or less power to make electrons go to different...
Feb23-12 04:35 PM
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If I put a red fabric under the Sun, what can this fabric be filtered in term of light frequency spectrum? Thanks in...
Feb23-12 03:06 PM
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we can calculate the refractive index of liquids like water using a converging lens and mirror by the standard method...
Feb21-12 06:48 PM
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Does somebody know what is seismic prospecting? and where can I find more info about it
Feb22-12 04:32 PM
davenn
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How many watts should a 40w bulb use at 120v?
Feb22-12 01:21 AM
cmb
8 1,747
When classically deriving the Schwarzschild radius of a black hole, the kinetic energy of an outgoing particle (moving...
Feb23-12 06:14 AM
mrspeedybob
5 1,369
Salutations everyone! I'm sure this is a simple question for many of you, but I don't understand why doesn't the...
Feb22-12 06:11 AM
tiny-tim
3 1,242
Would building a funnel/cone improve the power output of a given windmill? Let us say, for example, that we have a...
Feb23-12 03:12 AM
A.T.
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I have a shooter that shoots a ball at a fixed angle of 65 degrees from horizontal. The shooter is aimed at 3 targets...
Feb22-12 04:37 AM
tiny-tim
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Hello, As I understand, light can travel at the fastest known speed. What enables it to do so? What prevents...
Feb22-12 10:51 AM
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As we say that current is the flow of charges, but if we dye a conductor with red color and then connect the terminal...
Feb22-12 06:49 AM
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how can waves like sound have different wavelengths with same frequency?(Wα1/frequency) For eg, in air vel=wav*freq...
Feb22-12 06:17 AM
nasu
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taking derivation of distance equation is easy as every body knows. differentiating distance we get velocity and...
Feb22-12 12:40 PM
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I'm in my final year of college and I'm struggling to get a clear idea on the concept of per second squared. I mean a...
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Hi I have been reading a lot about how to calculate gas density and I am stumped. What I would like to know is how to...
Feb23-12 07:56 AM
MegaMan64
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Hello, This is a question that i've been contemplating for the last few days. I was watching a video about black...
Feb22-12 10:41 AM
DrStupid
1 871
Hi, My Physics textbook talks about a nucleus disintegrating. What does this mean? I understand that the nucleus...
Feb23-12 06:22 AM
esmeralda4
7 1,300
Is there a simple mathematical way of proving the left hand side equals the right hand side (see attached image)? ...
Feb24-12 06:58 AM
nasu
4 1,768
If the net sum of forces is zero , the object moves with constant velocity.(inertial frame) But , when this...
Feb23-12 06:01 AM
Doc Al
17 3,191
Hi all, I have a set of data that is number of counts - vs - angle. I need one angle for a calculation from this...
Feb22-12 02:55 PM
chloealex88
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Hello, How would you calculate the impulse during the time which a car drives in a circle. You are given the car's...
Feb23-12 08:38 AM
iamhe
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I need help finding the maximum force of an object from an impulse graph. The graph of the force vs time gives me up...
Feb22-12 09:19 PM
azureth
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Right now I am taking conceptual physics which is the most basic physics class my college offers. I am taking...
Feb22-12 10:10 PM
PhanthomJay
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Are there any circumstances, with the proper positioning, where an astronaut may witness rainbows or rainbow-ish...
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there is a liquid in a capillary tube. The tube pulls the liquid because of adhesive force and liquid pulls the tube...
Feb23-12 07:43 AM
Andy Resnick
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Hi, I have a general question about linear wave equation: Is solving the linear wave equation is equivalent to...
Feb23-12 03:30 PM
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Consider water flowing through a restriction with a pressure drop of 4 bar. Inlet pressure is 64 bar and the outlet...
Feb23-12 05:10 AM
Dutta
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Hi! My friend and me had a theoretical discussion about water in space. Assuming we will take a glass of water in...
Feb23-12 07:31 AM
Drakkith
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What is exactly one Coulomb? Wikipedia says "One coulomb is the magnitude (absolute value) of electrical charge in...
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cepheid
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Can someone please explain to me what the difference is between a parameter regression and a linear regression. How...
Feb24-12 01:07 AM
absurdist
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I'll be self-studying about chaos theory. I am looking for a comprehensive book on chaos theory which also touches...
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whoyameye
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Hi All I have been wondering a bit about how long time it takes for a mechanical resonator to change resonance...
Feb24-12 07:40 AM
Excom
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