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- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
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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
168 186,788
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
2 69,546
Hi guys. I have a physic exam coming up in about 4 days. I have tried to learn how to identify the direction of...
Nov5-05 03:51 AM
3 1,260
Think.. Can i ever make an object in vacumm and on a frictionless surface move with constant speed.. from rest?
Nov4-05 07:23 PM
15 1,792
When we realize what is temperature (kinetic energy) and what is radiation (photons), we find out that thermal...
Nov4-05 03:39 PM
7 1,325
A colleague has just posed this question and I need some help. There is a sealed room in space that has no external...
Nov4-05 08:22 AM
8 1,255
So these earth's magnetism is supposedly produced inside these generator-like chambers inside of which various...
Nov4-05 05:20 AM
3 2,615
I was thinking about that question (what is energy) and I realized that I could easily understand what energy is and...
Nov4-05 02:52 AM
5 1,505
i read an article below and i wonder if it has any relevance in fundamental physics principle of constant sped of...
Nov4-05 01:06 AM
2 1,254
is there anybody out there in UWO physics who is willing to tutor/help a grade 12 physics student (me)? I am willing...
Nov3-05 11:33 PM
0 1,065 they sell class IIIB lasers are these pictures genuine? can class IIIB lasers...
Nov3-05 06:30 PM
Claude Bile
21 2,141
it's just not sinking in.. i know a cell in phase space has 6 dimensions, 3 for momentum and the other 3 for position....
Nov3-05 04:46 PM
1 1,791
I've been very much intrigued by this picture of the surface tension of water supporting a metal paperclip: ...
Nov3-05 12:42 PM
8 1,627
Question, two cars, equal masses each going 40mph collide head on.... would this do the same damage as a collision...
Nov3-05 10:24 AM
25 3,054
I'm just thinking that since light is an electromagnetic wave, it must move sinusoidally. So, wouldn't it just be...
Nov3-05 08:42 AM
4 1,072
The entire text is taken from the following website:
Nov3-05 06:38 AM
1 7,926
Hi Guys, Because of the absorbtion and emmision spectrum we know that atoms have quantised engergy levels. For...
Nov2-05 06:40 PM
2 3,948
My understanding of EM wave emission on a particle level is that when an electron jumps to a lower energy level it...
Nov2-05 04:56 PM
5 1,244
This is a strange question, but why (in some physics books) are integrals given as: \int dx\,f\left(x\right) ...
Nov1-05 05:51 PM
Dr Transport
1 897
first i would like to set two things straight: first this is a question of something that seems very strange to me not...
Nov1-05 11:47 AM
Doc Al
17 2,007
Perhaps this isn't in the right section, although I couldn't think of a better one. If I wanted to start working on...
Nov1-05 09:38 AM
14 3,078
Ok i have a question that I've been wondering about for a while here... One of my chemistry professors stated to the...
Nov1-05 12:53 AM
1 5,083
I cant find it anywere, why does the bubble collapse? And could someone clarify acoustic levitation.
Oct31-05 05:33 PM
6 1,691
(hopefully I posted this in the right place) I am currently exploring the idea of creating a filter, with...
Oct31-05 04:39 PM
7 1,389
Hello everyone, in the 1910's Wilson build the very first cloud chamber based on watervapour and adiabatic...
Oct31-05 03:27 PM
2 1,909
We put ball A and ball B by distance R, every atom in ball A has some positive charges and some negative charges, same...
Oct31-05 01:46 PM
11 1,066
After a certain external field strength can it collapse?
Oct31-05 12:08 AM
1 1,676
How would our universe have evolved without gravitation, and how so would the universe appear at present? Does such a...
Oct30-05 11:29 PM
Loren Booda
13 1,925
What is 'High' Temperature superconductivity?
Oct30-05 07:56 PM
5 1,298
In school physics i have learnt that the focus for a circular convex(converging) lens is f=r/2 where r is the radius...
Oct30-05 07:48 PM
James R
3 825
erm i kno this has nothing to to with the original topic, but i didn't want to start a new thread..does everything...
Oct30-05 06:07 PM
Claude Bile
11 5,944
Does the temperature of the mercury affects the height of the mercury column in a barometer?
Oct30-05 01:16 PM
Pieter Kuiper
2 3,669
are photons only generated from vibrating electrons? only from atomic transitions?
Oct30-05 01:01 PM
3 1,663
Hi can anyone explain the logistics of vf^2 = vi^2 + 2ad to me? i mean its one thing to simply remember the...
Oct30-05 12:20 PM
3 41,735
Einstein predicted that all matter distorts spacetime, the greater the size in matter, the greater the distortion. In...
Oct30-05 09:55 AM
29 6,895
Lets imagine that there is a gravitational field and you are in a position that if you fall a meter your g increases...
Oct30-05 08:44 AM
Doc Al
12 1,039
How does a hand stroboscope work?
Oct30-05 03:40 AM
1 2,825
I found an equation on Wikipedia that I believe will give me the top speed of a theoretical aircraft. Mission...
Oct30-05 01:28 AM
1 3,039
Hello, Can you help by providing some answers to a Roulette problem I have. The problem is that a roulette ball...
Oct29-05 06:48 PM
1 3,730
hey I did this experiment where I dragged a mass by a scale until it moved to find the static friction. Then weight...
Oct29-05 01:10 PM
1 2,371
I have heard a thing or two about photons splitting into more photons and dividing the origional energy amongst...
Oct29-05 10:57 AM
4 1,221
Hi to all, another debunking request, if I may. I've heard it said that the shorter the wave used to create a...
Oct29-05 02:09 AM
Ivan Seeking
8 1,466

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