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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
168 184,021
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
2 69,005
how will the air temperature in a room affect the pitch of organ pipes?
Dec4-08 02:16 PM
physics girl phd
1 2,905
how will the air temperature in the room affect the pitch of organ pipes?
Dec4-08 12:27 PM
0 1,347
A sonic boom sounds much like an explosion correct? Explain the similarity between the two??
Dec4-08 11:51 AM
1 2,317
As it is cold here abouts i wondered, if one adds bubble bath soap to the bath water, doe's the water cool down...
Dec4-08 11:04 AM
1 1,070
I am currently working on constructing a Gauss Cannon using the simple method of some chrome balls with a neodymium...
Dec4-08 09:34 AM
5 9,146
Now I'm not the smartest person in the world...just a snowboarder trying to get some here is the information...
Dec4-08 02:44 AM
15 1,614
I have a question regarding the production of an effect similar to that of an earthquake. Let's presume that it's...
Dec3-08 09:41 PM
0 530
About a decade or so ago, I came across a web site that featured a reactionless drive some guy built in his garage. My...
Dec3-08 07:45 PM
2 1,531
Given: \lambda = h / (mv) , whehere lambda is the wavelenght of electron, h Planck's constant, m the rest mass of...
Dec3-08 07:03 PM
2 1,309
Alright, suppose you managed to build some type of massive ring around the Earth; concentric to the Earth, that is. ...
Dec3-08 05:17 PM
15 1,209
First of this is not an homework question but just a bit of a theory i am having a bit of difficulty understanding....
Dec3-08 04:37 PM
1 2,146
I'm trying to figure out the average deceleration of an aircraft that touches the ground at 104 knots (175.53 ft/sec)...
Dec3-08 03:02 PM
Doc Al
1 3,215
I am interested in finding and understanding the relationship between the hydrogen spectrum (which of the lines are...
Dec3-08 02:58 PM
1 712
Consider the system of a cart rolling down an inclined plane. Is the acceleration constant? Why?
Dec3-08 02:55 PM
Doc Al
7 1,666
I have some questions regarding the reflective properties of sound waves... If a spherically propogating wave...
Dec3-08 02:25 PM
6 1,236
hi ...i'm having a hard time figuring out this one. see attachment pic. a water coluumn, square based tube ( 1 x 1...
Dec3-08 05:10 AM
2 681
im doing an extended essay at school and i am loooking for help to adjust/refine my ideas. basically im...
Dec2-08 07:35 PM
Don Jusko
18 4,373
hi, i have an irregular object submerged in water . i would like to verify if i've understood the forces that act on...
Dec2-08 04:37 PM
1 958
Does Empty Space have Mass? Does Empty Space have Energy? from a previous post i learned that energy is...
Dec2-08 04:08 PM
8 2,215
Why can nothing(in theory) go faster that light. what is stoping it and what governs the speed of light itself? ...
Dec2-08 12:38 PM
48 5,285
Hello. I was wondering about the following question. Let's say I have a certain image. Given ones' galsses...
Dec2-08 08:33 AM
6 687
I want to create an electric field that will cause a copper BB to move. So far I have tried using a 9V battery with...
Dec1-08 11:44 PM
17 5,002
Hello, I am having some difficulty that I thought some of you might be able to help with. In the LRC circuit...
Dec1-08 09:28 PM
7 3,268
Hi, I'm trying to use a polariser/pockels cell/analyser combination to make a fast optical switch. I have build a...
Dec1-08 05:58 PM
0 1,387
I do not fully understand the Doppler effect in light. A theoretical question: If I was traveling near the speed...
Dec1-08 05:50 PM
9 2,217
Hello all, From where does the liquid helium get the energy to climb the sides of the pot that's holding it?...
Dec1-08 05:26 PM
10 1,839
I am currently trying to work out if two objects, of given mass X and Y, (given in KG) are both travelling toward...
Dec1-08 03:49 PM
4 3,830
Is the force of gravity transmitted by a particle or is gravity due to the shape of space (of some sort). If...
Dec1-08 02:02 PM
13 1,751
I once heard physics described as "a handful of equations that explains everything". If one were to make a list of...
Dec1-08 11:18 AM
11 2,076
If this question is completely stupid, forgive me, I'm a few years out of university and math and physics are quickly...
Dec1-08 09:00 AM
1 2,151
I was reading on the f-number of lenses for cameras...somewhere in the text, they stated that the area of the image is...
Dec1-08 07:49 AM
Andy Resnick
1 680
On Nov 28, 6:40 am, Ali <> wrote: > Is Hamilton Formalism and Lagrange Formalism Structurally...
Dec1-08 05:00 AM
Rock Brentwood
3 4,098
I don't understand, and I'm not kidding about that, TOO many people that are a hell of a lot smarter than me ponder...
Nov30-08 10:45 PM
34 5,197
I live in Seattle and bought some of those tinted yellow glasses and they really seem to brighten up my view, almost...
Nov30-08 04:42 PM
4 18,276
I finished reading The History of Pi by Petr Beckman, thoroughly enjoyed it and wondered what other works/activities...
Nov30-08 04:19 PM
5 4,761
Hello everyone! I have been searching all over the internet for an answer to this question: will moving a magnet...
Nov30-08 11:40 AM
2 1,276
I am trying to find a relationship between angular speed and increasing temperature for a rotating steel wheel with...
Nov30-08 08:24 AM
0 1,626
Hello: In my readings a question has come up in my mind about a ball that is rolling. Say you have a pool ball on a...
Nov30-08 02:22 AM
9 5,505
in the universe, as far as i can determine, every thing is moving.. energy moves, planets move, is there any matter...
Nov29-08 06:26 PM
Ranger Mike
13 1,420
Hello. I am in a black hole here. I've did a bit of research on my own on colors and here's what i've found,...
Nov29-08 04:29 PM
4 2,833

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