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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
2 69,450
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
168 186,459
Can anyone recommend a reliable source of information about eductors? I want to be able to calculate the size of the...
Sep28-10 03:26 AM
1 2,016
I need to calculate the compressability of several gases as they are being added to a storage cylinder. I would like...
Feb8-08 09:29 AM
Wolfgang M
2 7,929
I was reading Griffith's book on Consistent Quantum Theory. In it he constructs toy models where he starts off with a...
Nov4-06 03:21 PM
Chris Pollett
0 2,106
I was asking if we have some simple proof of the existance of the string in the String Theory and other matters as...
Jun2-05 12:29 PM
Chris Walters
7 1,402
I read Professor Michio Kaku book Hyperspace and have tried to create an online paper asking if light waves are...
Jul27-05 08:48 PM
2 1,994
hi im sorry this is probably going to seem very easy to all you viewers but up to this point ive had to teach myself...
Oct24-04 10:51 AM
James R
1 798
It is often said, that entropy is the average number of yes-no questions you have to ask to obtain the information...
Jun29-08 05:00 AM
Arnold Neumaier
4 2,341
Is there any (general accepted) conceptual precise and mathematically rigorous definition of the concepts "particle"...
Jul14-08 05:00 AM
William R. Frensley
1 1,947
Hello. I was listening to a podcast the other day when one of those involved in the discussion said the following: "...
Jun9-10 06:19 PM
6 2,509
My question stems from the visual perception of color. First I'd like to clarify what we're seeing. When we see that a...
Feb1-11 01:30 AM
Vanadium 50
2 988
Right this is a question about some radio noise that I picked up from my speakers last night. My speakers were...
Jul26-09 11:27 AM
2 2,731
Hi, I had a thought in my head and was just wondering something. If I have 2 exact steel balls with the same inital...
Feb22-04 02:33 AM
8 1,400
-------------------------------------------------------------------------------- it is generally accepted that 800...
Jan30-06 01:23 PM
5 7,686
Ok so when one drops a bowling ball hanging from a rope, it won't come back and smack him in the face. This I can...
Jun9-14 12:48 AM
Simon Bridge
3 479
Is there a way to determine the temperature outside without using a thermometer? Any formulas I could use?
Jun14-14 01:07 AM
15 525
What's the difference between electric and magnetic fields, specifically I someone was to send a charged particle into...
Jun9-14 12:45 AM
Simon Bridge
2 244
How is a rainbow formed? Is it a series of droplets that refract the light to our eyes, or is it multiple droplets at...
Jun9-14 09:24 AM
3 288
When there is a current of mixed resistances (like parallel and series together), how do voltage drop and current...
Jun9-14 09:34 AM
3 481
does anybody know the technique that they use at places such as CERN for determining the speed of the particles that...
Jun24-07 11:00 PM
0 883
does anybody know how scientists and physicists at places such as CERN determine the speeds of the particles that they...
Jun27-07 08:28 PM
17 2,293
I know that relativistically, it is absolutely impossible for anything to travel faster than the speed of light....
Jun26-07 09:05 PM
3 1,254
Quick Question...If a supersonic jet passes directly in front of you and you are infinitely close to the jet (there is...
Nov22-07 07:38 AM
21 3,153
I want to know what setup is best to create a stronger or faster air flow. I want to place 2 fans side by side you...
Feb3-08 12:23 PM
7 5,118
If you have 2 door locks like these ...
Feb13-10 12:36 AM
6 5,606
What would be the result of mixing helium, oxygen, germanium, nitrogen and uranium?
May24-12 05:16 AM
2 1,190
If an oscillator were to ever reach the visible spectrum, would an antenna connected with the oscillator output...
Nov20-10 02:15 PM
2 1,834
Is it possible to make a "raser" (Radio Amplification by Stimulated Emission), or what we know now as a laser, but in...
Nov20-10 03:58 PM
4 931
Considering Earth spins there is a centripetal force acting on us. How much force is acting on us? Say a 1Kg weight?...
Nov20-10 06:21 PM
2 1,698
I have noticed in faraday cages and in microwaves that the holes in the screen manage to prevent certain frequencies...
Dec12-10 02:04 PM
3 1,013
Hello! I am doing a project on an inverted (train hanging beneath the track) roller coaster. Do you all know of any...
May19-06 03:55 PM
0 1,601
Hi, On various websites I read that 70% of the heat loss of a pool is by evaporation, whereas up to 85% of the...
Nov4-11 03:46 AM
2 2,600
what would happen if the north pole was contained within the loop of the lhc at cern? the lhc at maximum speed can...
Jun6-09 02:36 PM
6 2,383
Hi, I was wondeing if anyone could help me out here. What form of energy can most efficiently be converted to...
Mar31-08 05:06 PM
3 1,192
I have here a class 1 lever style catapult built using leaf springs (A Da Vinci design) which relies on the stored...
Sep28-13 07:43 PM
0 634
I know that this is a bit off the beaten track, (its a physics question) but I'm trying to confirm the results of a...
Jul29-11 07:00 AM
5 641
i have a ? that has been nagging at the back of my head for some time something i noticed for example a car traveling...
Oct28-09 09:20 AM
5 829
Imagine I am trying to heat water from room temperature to 100 degrees Celsius, with a heating element of constant...
Apr7-13 10:38 AM
4 1,197
I was just wondering while watching Spider-Man 2 .. Would you need MORE or LESS gravity than the standard of 9.8 m/s2...
Dec12-10 02:16 PM
1 1,293
Hi guys, I am currently studying a basic college physics course at a university in New Zealand. The course is...
Jul31-10 05:27 PM
9 1,137
hi everybody i was involved in a crash about a year ago where the driver of the other vehicle t-boned me(me on my...
Mar22-11 11:18 AM
40 2,260

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