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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
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
168 183,782
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
2 68,962
consider a piston in an engine with a stroke of 86 mm and RPM 8000 which gives the frequency of sound it is...
Oct2-05 01:49 AM
1 1,346
Hi, I am a grade 12 physics student and my teacher asked us the following question: You have a perfect balance...
Oct2-05 01:37 AM
2 1,310
Hey, I'm currently studying Maths, Further Maths, Physics and Computing A-Levels in the UK (it's high school for...
Oct1-05 06:43 PM
0 870
Hello All, Recently I was asked to help provide some off the cuff calcuations for a stunt being peformed by a...
Oct1-05 03:11 PM
0 1,523
why do the excess changes of a thin infinite conducting plates spread out evenly on the two faces? Is that just a way...
Oct1-05 03:06 PM
2 1,082
Why the circuit must be closed to let the batteries send out electrons? If the circuit is opened, why do the batteries...
Oct1-05 12:27 PM
1 1,171
Please tell me a web site from which I can find the applications of physics in aily life. For example. what is the...
Sep30-05 10:15 PM
0 1,446
I am familiar with the idea of amplitude increases that can be produced by waves that are "in phase". I can imagine...
Sep30-05 08:47 PM
9 4,857
Direction of friction force is oppose relative motion of the surface . What is relative motion of the surface mean...
Sep30-05 07:27 PM
Doc Al
1 6,510
Hi, I recently wrote a text version of the old DOS Artillery Duel (or Atari's Cannon Duel) game. In this version, you...
Sep30-05 06:40 PM
0 3,827
If our space was imbedded in a higher dimensional space with an additional orthogonal space dimension, and a sound...
Sep30-05 04:14 PM
3 959
Hello everyone, I was wondering if there is any relation between the light and the sound speed in a liquid. For...
Sep30-05 03:45 PM
4 4,462
Have you ever heard of SMOT? There is a website saying about free energy.
Sep30-05 09:17 AM
2 1,328
Hello, An item in Jearl Walker's "The Flying Circus of Physics" discusses stirring tea. (4.63) I understand that...
Sep30-05 08:57 AM
Denise Wetli
0 1,136
Can anyone exactly explain 'Restituition'?
Sep30-05 08:23 AM
Doc Al
1 1,173
I have heard one definition of energy meaning a degree of inertial resistance... can anyone give me a different...
Sep29-05 11:48 PM
9 1,113
Hello, I was wondering, if I was in an elevator and wanted to play darts while ascending, would I have to adjust...
Sep29-05 05:29 PM
2 1,481
I'm looking for a text that goes into detail on the workings of laser ring gyroscopes. If it also included information...
Sep29-05 04:50 PM
Dr Transport
1 1,009
What does it mean by laser pulse 10 nanosecond?
Sep29-05 03:51 PM
9 3,277
To anyone who might know: If we add an additional orthogonal spacial dimension, w, to the usual 3 spacial...
Sep29-05 02:43 PM
3 1,796
Matter waves such as an electron have energy, frequency, wavelength. But are they part of the electromagnetic...
Sep29-05 08:00 AM
1 2,717
I have a problem with describe rotational motion for the cube, i met the rotational motion for the circle shapes but...
Sep28-05 03:17 PM
Geoff St. Germaine
1 1,279
Hey. Just out of curiosity, why is it super important to round everything in physics, even stuff such as 2.666(place...
Sep28-05 02:23 PM
Doc Al
4 1,533
does any one know of any new advances in zero-point physics
Sep28-05 02:23 PM
11 2,678
When I sit on a hard wooden floor I exert about 700N of force on the floor as it exerts this force back on me. If I...
Sep28-05 06:59 AM
11 1,816
I admit that my typing is not quite expert level at any rate. In fact, it's probably worse than many young people...
Sep28-05 04:48 AM
7 1,168
Say you have one photon travelling through free space. It has its energy level with its corresponding wavelength...
Sep28-05 12:09 AM
4 4,580
I know that if you put a magnet in a coil of wire and turn it you can generate electricity, but a friend told me the...
Sep27-05 12:48 PM
Doc Al
15 1,993
Hey, I need so assistance with calculation of rotational energy levels of symmetric top molecules. Can u help me?
Sep27-05 12:12 PM
0 1,324
We'd put this glass into cabinet. 1 day we suddenly heard a loud noise and then find the glass while it was smashed...
Sep27-05 10:22 AM
8 2,564
if you take the time to read this web site all of the recorces are very well labled usually after any thing or any...
Sep27-05 08:25 AM
Doc Al
4 3,439
I am currently enrolled in Physics 111 (at a university) without prior experience with the material. In highschool, I...
Sep27-05 06:09 AM
16 2,308
If matter and energy can be neither created or distroyed, how then does this law explain birth or growth. When a baby...
Sep27-05 02:05 AM
11 1,429
Alright, I'll try my best to use words for what I am thinking about but it may be a mess. Are we stuck in the...
Sep27-05 12:37 AM
8 2,259
i recently read and article say 2 months ago in the ottawa sun but my memory is fuzzy and i did not get to finish the...
Sep26-05 08:52 PM
4 1,100
hi every body, i'm new here abouts i have a question that has been puzzling me... if a flash of light was 'let...
Sep26-05 04:10 PM
4 5,284
what properties does a situation have to have in order for friction to be considered present?
Sep26-05 11:18 AM
2 775
Is it possible to induct electricty out of a florescent light bulb???
Sep26-05 10:53 AM
the blob inc
10 1,199
Can two objects that have no empty space between them move in opposite directoins?
Sep26-05 08:22 AM
8 1,381
I'll get straight to the point - my knowledge is based on Newtonian physics, I have not been introduced to quantum...
Sep26-05 12:58 AM
1 9,568

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