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Quality answers to common physics questions
Jul24-14 11:39 AM Greg Bernhardt 
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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
2 69,471
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
168 186,515
When we try to think what might have created the universe,when was it created,how,why,where etc etc, the parameters...
May29-06 04:14 AM
naveen
20 5,973
Sent this a few days ago, has not posted yet: I have been working with the Euler (perfect fluid) tensor lately, and...
May31-06 04:00 AM
Jay R. Yablon
5 1,331
Okay guys.This is a serious question. What is the property of a photon which makes it to move in a constant...
May31-06 04:00 AM
John Bell
21 1,715
Hi, Please help me, I can't make head or tail of the concept of an inertial reference frame. What is an inertial...
May28-06 12:33 PM
loom91
37 2,750
Hi, Is there any connection between Hugh Everett's "Many Worlds," and Hartle and Hawking's "No Boundary Proposal"?...
Jun3-06 04:00 AM
Oh No
2 1,224
Greetings! I've looked around in the FAQ and around the forums and couldn't find the answer to my question, so I've...
May31-06 02:20 AM
Allanon
5 1,445
I would like to understand Noether's Theorem. Every layman's explanation of this theorem states that momentum...
May28-06 03:43 AM
cliowa
3 2,140
What is 'redshift' ? one poster says depending on the color you see it will tell you which way the picture is...
May29-06 09:43 AM
Danger
20 1,516
Browsing NASA's "Multimedia Space Educator Handbook" I found this. "Pluto is now known to be far too small to have...
May31-06 04:00 AM
ralph
3 1,161
im reading some of feynman's lecture notes, and i stumbled upon a statement which i do not understand... he says...
May29-06 01:13 AM
fargoth
2 2,322
We all know Newtons law. An object in motion will stay in motion on straight path unless acted on by another force....
Jun1-06 08:03 AM
Hootenanny
2 974
Hi, If I have a weight, an example could be the weights in a Pendulum type clock (weight could be pounds, or tons if...
May29-06 10:11 AM
russ_watters
4 4,037
while looking into huygen's principle i found a site that showed its just another way to look at waves in 1\3\5\...odd...
May29-06 09:30 PM
robphy
5 2,906
Of course, this isn't a place for such issues (that topic of mine ('Physicists')); but, here, I just want to point-out...
May31-06 10:01 AM
SAZAR
2 841
Hi, I like to build a Farnsworth-Hirsch-Fusor for a school project. I want to use an ordinary bell jar but I am not...
May29-06 02:03 PM
Farnsworth
4 1,846
Hi, all. I need an optics specialist here. I seem to recall from many years ago that under the proper conditions,...
May29-06 10:40 PM
Danger
4 1,317
Is the energy required to accelerate mass m 1 meter/sec2 for 1 second, the same whether that mass is: a) currently...
May31-06 08:22 PM
tardis
6 3,094
I was wondering: From the point of view of an observer who is in motion relative to the sun, the sun has a certain...
May30-06 01:16 AM
MonstersFromTheId
3 1,171
If linear accelerator were to accelerate an electron very close to the speed of light towards a positron source, (or...
May30-06 12:31 PM
Bob3141592
3 1,849
It's not that I don't believe that all i.r.f.'s are on an equal footing, it's just that I can't seem to get that to...
May31-06 07:23 AM
Kurdt
3 1,401
Considering the free vibration response of a single degree of freedom system: It is observed ,that, larger the...
May31-06 07:55 AM
Doc Al
1 4,083
Hey, guys. Physics at my 6th form college is rather dull and I was going to ask about organising lectures and...
May31-06 07:46 AM
Kurdt
1 1,145
If there is anyone out there that can answer this it would be greatly appreciated. I am stuck with this one. At...
May31-06 12:04 PM
jasc15
3 1,775
The big event of the softball season, the Women's College World Series, begins Thursday. One aspect I find interesting...
May31-06 09:13 AM
Danger
3 5,385
I'm trying to calculate the stress placed upon knee joints by low karate stances. If I assume a body weight of 200...
May31-06 10:05 AM
matb
2 2,822
I'm a karate instructor desperately trying to find a model or formula that explains what happens to the to speed and...
May31-06 10:13 AM
matb
3 2,736
i am doing an EEI on electrical toys. the toy ive chosen is Shocking Roulette, can any one tell me how they work or...
May31-06 08:23 PM
chigga
3 1,353
Hi, With all the wind farms being put into production recently, does anyone know what the average size generally is....
May31-06 12:33 PM
optimizer
2 1,001
this question concerns two photon annhiliation where e- + e+ -> 2gamma where p+,- is the momentum 3 vector of...
May31-06 04:00 AM
Zak
0 653
Hi guys, pay attention to this fun gun puzzle: Imagine the gun of Billy the Kid and that of Pat Garret are quantum...
Jun3-06 04:00 AM
Henning Makholm
1 569
In a paper in Apeiron journal http://redshift.vif.com/JournalFiles/Pre2001/V0N01PDF/V0N01JAA.pdf author Toivo...
May31-06 04:00 AM
Ray Tomes
0 815
Journal articles in the early decades of the last century sometimes seem to have appeared in duplicate, first in the...
Jun3-06 04:00 AM
Timo A. Nieminen
1 803
http://www.literateprogramming.com/quantumoo.pdf] "Why Natural Scientists Should Care About Object-Oriented...
May31-06 04:00 AM
Juan R.
0 845
I wonder whether left-commutative operations play a (major or minor) role somewhere in physics theory. A...
May31-06 04:00 AM
bo198214
0 1,035
To start off, the problem. We had to construct a boat out of a 12''x12'' piece of aluminum foil. The purpose was to...
May31-06 04:42 PM
Gokul43201
1 6,120
Thin wires tend to creep (extend longer over periods of time), particulary at high temperatures. Is there a...
Jun1-06 12:10 PM
FredGarvin
2 1,160
hi. Im not a physicist and i have a question about quantum physics. If you shoot electrons towards a double slit...
Jun2-06 11:36 AM
quddusaliquddus
3 762
I'm trying to figure out if it is possible to accurately calculate the mass of a granular material (something like...
Jun2-06 03:00 PM
j777
4 1,830
foulbr3@yahoo.com wrote: > My questions are: > 1. How can I find the ideal mixture ratio of oxygen to aluminum?...
Jun3-06 04:00 AM
Uncle Al
0 882
Chalky wrote: > I understand that the velocities of light and gravity are the same in > GR theory. > > Doe this...
Jun3-06 04:00 AM
Greg Egan
0 804

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