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Quality answers to common physics questions
T 11:39 AM Greg Bernhardt 
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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
168 180,244
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
2 68,315
Let me start by saying that I’m a novice when it comes to various theories in Physics and what I write below are my...
Jun20-05 08:53 AM
4 4,516
How to get spectral density (e.g. of voltage noise) from a fast Fourier transform of a signal?
Jun20-05 04:10 AM
0 1,183
How to get spectral density (e.g. of voltage noise) from a fast Fourier transform of a signal ?
Jun20-05 03:34 AM
0 1,300
Hi, Sometimes when a jet plane is flying above you you can see the white tail from the motors, and sometimes not....
Jun19-05 03:07 PM
5 2,684
this is my first post in this forum. i have a question : i have read that when light refracts into other medium...
Jun19-05 05:01 AM
5 2,130
hi, i have an OPTICS question . i am confused about the "real image" and "imaginary image". could not understand...
Jun19-05 04:05 AM
2 10,006
Suppose we have a space with a number of superpositions and interference of sound waves. We are unaware of the...
Jun19-05 01:02 AM
0 770
I sometimes wonder how speed of light is a universal constant...every other object's speed varies wrt the inertial...
Jun18-05 12:59 PM
0 770
Rather curious to know whether anyone here tried to build a radio wave transmitter and intercept a radio station by...
Jun18-05 10:21 AM
7 2,085
:!!) i need a phycic me and my friend have a case. these woods by our house are strange. around 12:00 we say this...
Jun17-05 11:47 PM
0 1,354
In his Principia Newton claimed that a hollow sphere exerts no force on a particle floating inside (Propositions 70 to...
Jun17-05 09:22 PM
9 4,796
Are there any nice general physics sites besides this?
Jun17-05 05:37 PM
2 962
Are there many experiments you can do that are like, 'famous' that you can do at home without spending hundreds or...
Jun17-05 05:19 PM
18 8,712
QUESTION: 1: Stars are known to flicker.Estimate the number of photons entering the eye of an observer when he...
Jun17-05 01:38 PM
1 1,073
Why it that as the speed of an object increases, time seems to slow down for the object experiencing that...
Jun17-05 01:34 PM
8 2,322
Hello, I was looking for the name of the principle which governs the following- given a constant air flow- air...
Jun17-05 12:12 PM
4 5,774
if you walk through the back of the event horizon, would you appear on the other side, particle-by-partcile,...
Jun17-05 12:00 PM
8 926
I need to do some homework for court. It has been more than 30 years since I was in a physics class. I was the...
Jun17-05 09:35 AM
2 6,114
Hi all, I am sorry this could sound like heard many times before, but I am trying to understand this problem and...
Jun17-05 06:23 AM
Meir Achuz
1 1,441
"A way of conceptualizing the nature of primes...." We know Eratosthenes observed that the primes occur at 6n+-1....
Jun16-05 11:05 PM
39 6,734
Hi folk, In the various literature I have read relating to time travel there always seems to be an assumption that if...
Jun16-05 09:46 PM
10 1,758
Ok, so here's the basic idea. You have a refrigerator, with four walls each 6ft x 2ft x 4in. The walls are made out of...
Jun16-05 04:48 PM
James Jackson
3 1,712
friends i have a derivation which proves that Einstein's Energy mass relation is wrong. I know as far as my knowledge...
Jun16-05 04:15 PM
8 2,015
It's that time of the year again when Brookhaven National Lab opens its doors to the public in a series of Summer...
Jun16-05 02:08 PM
0 915
Everyone, I wrote a paper for solving the problems remained by the General relativity. It also overthrows the...
Jun16-05 08:37 AM
14 2,712
I believe I have put together a pretty compelling case to demonstrate that the sun has a solid surface made of calcium...
Jun16-05 07:59 AM
1 3,184
ive been bored so i was lookin for experiments to do for summer break and i came across one on making making and...
Jun16-05 04:32 AM
8 2,519
I have a layman's understanding of the subject of ZPE, but one thing i can't wrap my head around is one claim hear a...
Jun16-05 01:16 AM
0 1,154
E = mc^2 Please explain to me why the speed of light is squared.
Jun15-05 08:39 PM
18 2,076
Hey everyone, I was thinking about what are all the local conditions you can measure, such as: local gravity, the...
Jun15-05 06:20 PM
0 830
I believe that I have compiled compelling evidence from the TRACE, SOHO and YOHKOH satellite programs to suggest that...
Jun15-05 04:33 PM
3 2,860
Is the Human Genome project complete? How is the current technology advancing in comparison to the predictions made in...
Jun15-05 11:15 AM
2 1,513
I'm new to the topic of theoretical physics so can someone fill me in is it possible to go back in time and go to the...
Jun15-05 06:08 AM
Nomy-the wanderer
23 5,426
I am trying to replace a halogen bulb in an old makeup mirror. The bulbs has two metal prongs coming down. The...
Jun15-05 01:25 AM
3 1,730
this is kinda wierd, and I'll have to admit I'm going out on a limb, but I seemingly found a relation between four...
Jun14-05 05:58 PM
James Jackson
13 2,915
An article about some Peter Lynds fellow and his mind-blowing theory of time that has "rocked the physics world"...
Jun14-05 11:41 AM
26 19,639
will magnet attract to apaper rub to a ballon
Jun14-05 07:05 AM
0 2,161
Is the frequency of everyone's voice unique?I couldn't find any article through web about it!
Jun14-05 12:25 AM
8 1,447
It is really hot, and humid here. I have my fan running almost constantly. Ever since I was a kid (well I am still...
Jun13-05 09:06 PM
13 3,025
Hello, All Million dollor question....Did the U.S. get antigravity or gravifugal technology (whatever you want to...
Jun13-05 08:02 PM
6 2,429

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