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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
Cthugha
168 186,325
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 69,420
The spectrum of the Cosmic Microwave Background radiation - the flash of the Big Bang, aligns almost precisely with...
Oct15-12 03:51 PM
Khashishi
12 1,418
An automobile moving along a straight track changes its velocity from 40 m/s to 8 m/s in a distance of 200 m. ok...
Oct15-12 03:47 PM
Redbelly98
2 661
Before I say anything, I dont really have any experience in physics. But this question just popped into my mind...
Oct15-12 01:20 PM
cabsac
6 1,316
The KE (kinetic energy) of an electron revolving around a nucleus is always positive, and the PE (potential energy) of...
Oct15-12 08:26 AM
AudioFlux
2 1,173
why is it the highest temperature? what happens if it is exceeded? is there an experimental proof that it is the...
Oct15-12 06:56 AM
jambaugh
11 4,185
What causes sound to be effected by the thickness and length of its vibrating object? Is it that the length that...
Oct15-12 04:58 AM
Drakkith
2 978
From some of the questions I'm encountering my text, it seems like the writers are implying that there always needs to...
Oct15-12 04:43 AM
Studiot
1 672
Can someone explain how carbon nanotube batteries work? They are carbon nanotubes put on a layer then and covered in...
Oct14-12 10:55 PM
Johnleprekan
0 863
I was wondering if there has been a study done on what happens to a photon wave packet when half out of a device while...
Oct14-12 08:15 PM
Drakkith
8 2,273
How do particles moving around a nucleus, planetary and other objects moving around a star, stars.. solar systems and...
Oct14-12 08:05 PM
Drakkith
1 783
Basic question about velocity/acceleration/position. I am playing with accelerometer data. I am trying to plot the...
Oct14-12 12:36 PM
HomogenousCow
6 1,133
Hello all, New to this forum. Have had an interest in physics for a long time and studied it for a while at...
Oct14-12 11:51 AM
jtbell
9 1,251
Hello all, I've got a quick question, I am sure it will be resolved by the first comment, but I'm just looking for...
Oct14-12 10:53 AM
pnorm91
3 852
I heard somewhere that if spring is cut into two pieces of equal size,the spring constant of each piece will double...
Oct14-12 09:59 AM
Vanadium 50
1 835
Hi everyone, I'm looking into x-ray spectra as well as radio chromic film. I want to expose the film to scattered...
Oct14-12 09:22 AM
js1magee
0 552
Hello guys, I'm not sure this is the right place to ask the question, but I hope someone would have experience with...
Oct14-12 07:27 AM
mfb
3 578
Can any one tell me a self teaching book or lecture notes on physical optics which has all the concept written in very...
Oct14-12 03:56 AM
Shan K
2 1,174
Hi, Looking at the emission spectra of Mercury, for instance, how do the lines (I count 9 in the visible range:...
Oct13-12 09:21 PM
nasu
3 826
Suppose a cantilever beam stands uprigt, such as a tube attached to the floor in one end and free at the other end....
Oct13-12 05:39 PM
AsgerJon
0 541
Spring force always creates a doubt in my mind... My question is that.. When two masses say m1 and m2 are...
Oct13-12 04:42 PM
D_DaYwAlKeR
5 772
Hello, I have two different materials, wood and iron in two different environments. I have both the wood and iron...
Oct13-12 03:27 PM
mfb
7 1,146
Hi all, I'm having an online discussion and curious to know about the forces a 3-point seat belt has on a car. ...
Oct13-12 02:22 PM
mfb
4 1,741
I came across a problem my teacher assigned. We are asked to calculate frequency of electron having certain energy. My...
Oct13-12 01:18 PM
MisterX
7 3,243
This is pretty simple,but finding the correct formula does not seem to be that easy for me. How could I calculate...
Oct13-12 09:44 AM
nasu
5 3,100
Now i am a refregration apprentice so by know means am i qualified or mabe have no idea what i am talking. now i...
Oct13-12 05:01 AM
rasco400
5 1,365
Hi I want to know if the water level equalize in communicating vessels, when in one of the vessels there is a vortex,...
Oct12-12 07:32 PM
r6900
2 1,174
Hi folks, I am new to the group. I was willing to know what is the importance of polarization and also wave...
Oct12-12 06:43 PM
Bobbywhy
1 868
Is there any decent way to quickly spot if I should divide a 2d figure defined by functions into horizontal or...
Oct12-12 12:46 PM
Nikitin
1 678
I just want to know if I am understanding this correctly. I am wondering what effect the rolling resistance has on...
Oct12-12 12:15 PM
Pkruse
1 1,196
I'm trying to understand what I have just learned. So some sort of browser based code or binary was discovered in...
Oct12-12 12:09 PM
sophiecentaur
2 1,292
Hi, I'm trying to understand electrical potential and potential difference. I was wondering if anyone can confirm if...
Oct12-12 11:57 AM
KitchiRUs
7 1,499
I have two questions: 1) Is it in general assumed that the parallel plates of a capacitor are fixed to some surface...
Oct12-12 11:44 AM
mfb
2 982
Analyzing a BJT using pi-model
Oct12-12 09:48 AM
sophiecentaur
1 613
Say I have a gas enclosed in a bottle with a weight on top exerting pressure P0. Let the gas pressure be P. If P0 is...
Oct12-12 07:17 AM
Chestermiller
7 1,337
This is a question about electromagnetic waves and gravitational waves. Let's say we're on the Earth and we're...
Oct12-12 03:16 AM
Drakkith
13 1,817
Hello, I was taking a shower and started to think about balloons and helium and this question came to me: Wouldn't...
Oct11-12 07:35 PM
DrSmersh
4 1,056
Years ago I read about this but can't find any reference to it now. The underlying reason, as I remember it, is to do...
Oct11-12 07:07 PM
Drakkith
2 872
Hi , I've been wondering is there a metal or some kind of material that can hold a magnetic flux like a transformer...
Oct11-12 05:59 PM
sophiecentaur
12 1,381
Hello, I am new to the forums and physics in general. I hope I am not posting in the wrong place. My understanding of...
Oct11-12 05:17 PM
0xDEADBEEF
3 1,169
Hi In this online lecture (click "View Presentation"), Prof. Allam discusses the solution of a diffusion-capture...
Oct11-12 03:32 PM
mzh
0 544

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