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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 69,358
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
168 186,012
Its my understanding that a photon will travel and exist in space forever. My question is if light, whether it be from...
Oct17-12 06:20 PM
Drakkith
8 773
I noticed something interesting in nature yesterday. I was cleaning a sink that was full to the brim with water and...
Oct17-12 09:01 PM
Niaboc67
1 932
Since momentum = mass x velocity Therefore for light P = mv P = 0 x 3x10^8 P = 0 m/s Can anybody explain ?
Oct17-12 09:51 PM
cepheid
9 1,021
does spring always do negative work? how could it do positive work? I can't think of any situation
Oct17-12 10:01 PM
daivinhtran
2 671
Please do your best to describe E=Mc^2 to me in the most plain English you know and as basic as possible without...
Oct17-12 10:16 PM
jtbell
3 569
How to derive a formula for speed of falling body in earth atmosphere? I know distance from surface, pressure at this...
Oct17-12 11:33 PM
cjl
14 1,510
Hello, everyone, I am doing an egg drop for my science class, (not sure where to put it so I put it here, sorry if...
Oct18-12 01:37 AM
Simon Bridge
12 2,837
Why does nature follow the principals that it does? say there is no God, why are the parameters and laws/constraints...
Oct18-12 02:28 AM
Niaboc67
2 908
I have learnt that due to upward thrust of air, the weight of an object is reduced to some extent than the real...
Oct18-12 03:43 AM
bhallagsm
9 1,623
What is there in a moving bicycle that it is easily balanced?
Oct18-12 05:40 AM
harrylin
1 407
dx/dt = η(t) dy/dt = ζ(t) where <η(t)>=<ζ(t)>=0 <η(t)η(t')> = 2Dδ(t-t') <ζ(t)ζ(t')> = 2Dδ(t-t') If...
Oct18-12 11:22 AM
Dessert
0 501
Think Im having a brainfart here, so I need a tad bit of help. Sorry, imageshack rotated the image for some reason:...
Oct18-12 11:43 AM
Per Oni
4 1,028
Recently a device invisible to a static magnetic field was described. The device features a cylinder with two...
Oct18-12 12:20 PM
Alkim
4 709
So, I read an article yesterday about a potential design for a spacetime crystal. The idea behind a spacetime...
Oct18-12 01:17 PM
Alkim
4 845
Can we make gold from nuclear reaction in the lab? If yes, what are the nuclear equations?
Oct18-12 02:01 PM
Vanadium 50
9 1,218
Hey guys I am a high school senior and this is my first year taking physics. I am really interested in the subject...
Oct18-12 03:15 PM
Surgikill117
7 1,105
Hello All! Does anyone have a good design for a Cloud Chamber using Peltier Coolers? I'm wanting to build a chamber...
Oct18-12 04:30 PM
jambaugh
1 778
I am in my second year of my undergraduate studies and I am involved in a research society. Does anybody know of/can...
Oct18-12 05:53 PM
jtbell
8 1,303
I want to know what exactly is magnetic and electric field fringing and what is the cause of it?
Oct19-12 01:48 AM
cragar
1 2,340
So I've studied physics at the university quite a bit and was a bit surprised when I couldn't answer this simple...
Oct19-12 03:17 AM
tiny-tim
5 1,186
For a physics project, a few friends and I got ahold of a couple of balls that would record the time of an impact....
Oct19-12 05:50 AM
mikeph
6 1,266
When people talk about harmonic oscillators it seems to me that they always assume either that the relationship of...
Oct19-12 06:05 AM
sophiecentaur
14 1,007
If I have a matter wave (for example, electron waves in a electronic microscope) at a given wavelength λ, and I move...
Oct19-12 07:29 AM
mfb
6 962
If electrons are shot through the double slit one at a time, is it observed that each electron hits randomly in one of...
Oct19-12 07:50 AM
sophiecentaur
3 670
What are the conditions required for the pressure inside the object to be fixed?any examples are appreciated.:smile:
Oct19-12 08:10 AM
sophiecentaur
1 513
I'm quite new here, but here's my question: Is there a way to make one magnetic pole stronger than another?
Oct19-12 08:41 AM
mfb
1 609
Beer´s law does not apply if there is any scattering. In a pure absorber, if 1 layer absorbs 50 % of incident light...
Oct19-12 09:57 AM
Alkim
4 685
Hi, does anyone know how to calculate the total absorptin of a sample from its labdam-absorbance spectrum? I found a...
Oct19-12 10:00 AM
mfb
1 681
For a fixed pressure differential will the flow rate remain constant or will it increase as the restriction decreases....
Oct19-12 10:18 AM
Alkim
17 3,099
Hi Thanks for Taking a look Need help to settle a debate (now argument) Viewing the "Titles of topic" in this...
Oct19-12 02:46 PM
NumberNewbie
15 1,357
I wanted to ask from my intuition of Newton's First law that body in motion remains in motion. Assume we kick a ball...
Oct19-12 02:48 PM
xAxis
1 581
I'm trying to understand if a really heavy object on earth, say a mountain, would move if I push it with my bare...
Oct19-12 04:45 PM
Nugatory
2 960
I was looking for some help on getting displacement from acceleration data (using an accelerometer). I found this old...
Oct19-12 05:07 PM
A.T.
1 799
Given a Universe abiding solely by deterministic laws, Laplace's reasoning seems to make perfect sense. So let us take...
Oct19-12 06:12 PM
Chronos
3 1,013
Go to any article on wikipedia, for example http://en.wikipedia.org/wiki/Lcd Now Ctrl + F and find a word, for...
Oct19-12 06:51 PM
papernuke
0 572
Hello, I consider myself an up-and-comer theoretical physicist (although getting a bit of a late start), and there's...
Oct19-12 07:02 PM
DiracPool
3 693
so, i am fairly good in physics, but, i do have a Q. with a torque wrench, does the wrench move force perpendicular...
Oct19-12 09:15 PM
Physics_Kid
8 898
If room A is connected to the outside with a window and room A has a fan on; Would the air would try to move out from...
Oct19-12 09:28 PM
davenn
9 1,307
Where does the potential energy go if you carry uranium to a nuclear power plant on the top of a mountain and part of...
Oct20-12 02:09 AM
DrZoidberg
12 3,694
It is mentioned that the conditions of interference is that the waves should be coherent and synchronized. What is...
Oct20-12 03:26 AM
bgq
2 644

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