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Aug12-14 11:12 PM Simon Bridge 
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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
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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
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The usual "proof" entropy is a state property is like that: "Consider a system which undergoes a reversible process...
Jul13-14 06:30 PM
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I don't know how to explain the classical view of an EM wave quantum mechanically. First off, when you see the...
Jul13-14 05:45 PM
Drakkith
8 824
I heard that many industries use lead for shielding harmful radiation. do you know why?
Jul13-14 03:50 PM
mathman
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Let's say two equally massive objects move toward each other at equal velocities (let's use 30 kg and 5 m/s for the...
Jul13-14 02:10 PM
Niko Bellic
4 633
What is the difference between static pressure,dynamic pressure,pressure and total pressure? could anyone explain...
Jul13-14 09:57 AM
Simon Bridge
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Hey all, I recently read a bit about proposals to induce "artificial gravity" on a mars mission by spinning two...
Jul13-14 05:50 AM
UltrafastPED
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Hi guys, I am a new user of QCM and I am having trouble reaching equilibrium. I have isolated the chamber from air...
Jul13-14 05:46 AM
UltrafastPED
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If I were to strike an arc between a copper cathode and a tungsten anode would copper be deposited on the anode? If so...
Jul13-14 12:55 AM
Warpspeed13
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I am doing a high school research project on nuclear fusion and i just wanted to double check if my understanding of...
Jul12-14 05:31 PM
mfb
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Are there ANY possible photographic or other types of images of a water molecule? Or are they simply too small to...
Jul12-14 01:32 PM
Mintaka
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Hi Guys, I am doing a bit of work with dynamic light scattering (DLS) data. It is one of the many areas of science...
Jul12-14 09:31 AM
Steve Drake
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I couldn't understand why there is, ∂E_{y} and ∂E_{z} term in the equation, for the x-component of the force on...
Jul12-14 08:19 AM
Simon Bridge
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So I know how to solve for two initially moving objects that collide one way, but I was reading on this website...
Jul12-14 02:05 AM
Simon Bridge
1 601
http://www.physicsforums.com/showthread.php?p=2881300#post2881300 According to the quoted thread above and...
Jul11-14 11:36 AM
ANvH
10 1,052
If a charged particle is at rest, external magnetic field cannot move it. If an external electric field is applied,...
Jul11-14 10:35 AM
ModusPwnd
5 882
Hello. I saw some video when a man made primitive stove from can, rubbing alcohol and steelwool. He modifed the can...
Jul11-14 09:40 AM
NascentOxygen
4 1,017
Hi, While experimenting with various LED's in LN2, I noticed some strange behaviour from my green LED's. As...
Jul11-14 07:28 AM
Artlav
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So here's the familiar SI base units from NIST length mass time electric current thermodynamic temperature...
Jul11-14 05:34 AM
f95toli
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Hello all, I was wondering a way to make a simple vacuum chamber with a relatively small volume (probably won't...
Jul11-14 05:23 AM
f95toli
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I wanted to find out the difference between a supernova, and the energy it would take to blow up the Solar System. ...
Jul11-14 12:57 AM
Bandersnatch
10 1,409
I have two sphere. 1) one with free electron, if i connected sphere with the earth by conducting wire all the free...
Jul10-14 09:05 PM
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10 1,061
I am a Grade 11 student and am working on a physics research about Fraunhofer diffraction. I have 2 very basic...
Jul10-14 08:46 PM
cosmik debris
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http://www.youtube.com/watch?v=UdV_fEbRqss I saw a video where a guy has set up what appears to be somekind of an...
Jul10-14 05:54 PM
NascentOxygen
21 2,322
Hi. I'm designing what effectively is a large door on hinges. The door has the following properties Mass = 336 kg...
Jul10-14 01:45 PM
A.T.
4 925
Combining first and second law of thermodynamics we can get the following equation TdS=dU-PextdV First question:...
Jul10-14 01:07 PM
Chestermiller
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Is there a reason geometrized units convert everything to length? Why not time or something else? This seems odd...
Jul10-14 08:38 AM
DaleSpam
2 628
I have attached a problem. ∫dl = A1B1 = 1 Here dl is a length of wire but in problem it takes distance between...
Jul9-14 11:52 PM
DeltaČ
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Hey guys i had a question in my paper why electrostatic field lines cannot be discontinuous in charge free region...
Jul9-14 10:11 PM
Simon Bridge
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Good morning I need to ask about the exact formula for the phase shift used in stimulated Brillouin scattering...
Jul9-14 07:16 PM
eahaidar
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I was wondering if I could create plasma inside my own apparatus using a laser pointer and nitrogen..
Jul9-14 06:28 PM
Hxopblxvj
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The Volume of an atom comes from its electrons and mass of an atom comes from its nucleons. I don't understand why? ...
Jul9-14 05:28 PM
TheDemx27
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Hi, please could someone help with my confusion over these two qauntities. In class we recently learnt that magnetic...
Jul9-14 05:14 PM
Jimmy87
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i had a question in my paper why electrostatic field lines cannot be discontinuous in charge free region i...
Jul9-14 02:33 PM
Meir Achuz
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Hi all. This is not a homework question, I'm 33 and far away from homework. It is just a personal doubt. I've read a...
Jul9-14 12:40 PM
rcgldr
17 1,543
I may have some confusion with the terms "pressure" and "gravity" here. If hypothetically we could sink towards the...
Jul9-14 10:38 AM
Nugatory
15 1,289
Hi all, been a while since I've posted here, but figured this would be a great place to ask this question. I've...
Jul9-14 02:52 AM
spacediver
13 1,406
Hello. Do you know that if you take grape to the microwave, you can make some plasma? I think so....
Jul8-14 04:25 PM
UltrafastPED
2 744
I have seen a discussion of what would happen for an ideal gas expands irreversibly and adiabatically until absolute...
Jul8-14 03:50 PM
elegysix
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After calculating the gravitational PE using : PE = ( G * m1 * m2 ) / d Then i split the result into KE between...
Jul8-14 01:22 PM
mfb
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suppose you had a ball rolling down a ramp, without slipping and compare it to a ball that starts with a velocity u...
Jul8-14 08:21 AM
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