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May25-09 10:31 AM ZapperZ 

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General Physics

- Nature and properties of matter and energy. For any physics topics not applicable to the categories below.
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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 aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
Apr8-14 10:13 AM
166 160,161
I have a question which may be based in a complete misunderstanding of how "color" and our perception of it works in...
Sep20-09 05:53 PM
Bob S
2 1,455
Just a little question. I'm a little curious. In the classical sense, a reference frame in freefall would, of...
Apr21-03 06:01 PM
56 4,684
Hi folks! Long time listener-first time caller. I am building a coil winder for building my own transformers-fun...
Nov23-05 05:26 PM
0 3,668
After doing some work with a painter friend we were coming home and I put my arm outside of the window as we were...
Jul11-12 07:50 AM
3 744
Hi, I have been stuck on this question for a while, and I need help figuring it out. For a lab, we had two ring...
Nov26-12 09:41 PM
4 1,244
I am working on programming a simulation/model of a piston engine (steam, gas, etc). I have run into some trouble...
Oct26-08 08:17 PM
2 2,346
just like when any object is immersed in water it feels lighter because a net upward force is acting on it same way do...
Feb6-11 01:26 AM
11 3,806
I'm working on a table for a SciFi RPG to construct ship thrusters. The thrusters have a certain output in watts and I...
Oct1-11 03:53 PM
10 1,087
Langrangian description: one essentially follows the history of individual fluid particles (I understand this, it's...
Aug24-08 01:52 PM
Andy Resnick
5 12,089
Find the find the eigenfunctions and eigenvalues of a two-dimensional isotropic harmonic oscillator. I don't...
Oct2-07 09:12 AM
1 6,553
What do you understand about this? From high school, I just memorize the definition of it, the number of ways of...
Oct21-07 06:18 PM
9 2,699
1 u = 1/12 of the mass of a neutral carbon atom with nuclear charge 6 and mass number 12, 1 u = 1/12 * 12.000000...
Jan12-08 12:57 PM
1 1,917
I'm not sure does which surface facing the object matters? For example, ...
Sep17-08 03:59 PM
9 1,501
Consider a scenario of a sound wave inside a closed end and opened end tube. We always learn that the displacement...
Oct21-08 05:59 AM
2 5,750
I want to superpose two laser beams to create the beat frequency. I design the system to be like this . Two...
Nov1-08 10:53 PM
0 1,955
In order to increase the diffraction efficiency of the AOM, we need to reduce the beam size of the laser. According to...
Nov10-08 08:14 PM
2 1,195
I learn that increase of the beam size of the laser before coupling it to the fiber can increase the coupling...
Apr6-09 01:50 PM
3 1,839
I want to ask, is counter propagating beam written as co-propagating beam? which means two beams that are...
Apr7-09 06:21 PM
Andy Resnick
1 1,725
Hihi, I put a photodiode's legs to both the input for a differential amplifier ...
Aug10-09 04:44 PM
2 1,421
A light passing through a lens will be focused for a converging lens. However, to look at it carefully, it'll not...
Nov18-11 09:58 AM
8 2,469
According to my knowledge and understanding of things, mirrors reflect light perfectly because they are almost...
May14-10 08:11 PM
8 1,621
"Mike Fontenot" <> a écrit dans le message de news: > My...
Feb14-06 06:00 AM
0 754
Hello, I've the pleasure to announce that my PHD thesis is now online at the following url:...
Oct11-06 02:43 PM
0 634
"Jay R. Yablon" <> a écrit dans le message de news: O972h.538$ >...
Nov4-06 06:21 PM
0 1,081
"Thomas Mautsch" <> a écrit dans le message de news: > Dirac's belt trick is...
Nov20-06 06:38 PM
Thomas Mautsch
1 1,144
How does microwave produced by magnetron relate to the power? For e.g., magnetron produces 3000 MHz microwave and...
Feb9-09 05:25 PM
1 1,269
-If you have a magnetron produce __# of microwaves, each with frequency of __ MHz, how can one calculate the power of...
Apr30-09 01:38 AM
1 3,734
If a microwave generator (for e.g., magnetron or klystron used to particle accelerator) is said to have power of for...
Apr4-10 12:15 PM
1 2,190
Please explain "inducing electric field" which I found from reading about magnetron and klystron. This is what I...
May3-10 04:03 PM
0 1,206
Hi, I am not super good in math so I really need some help with this math problem. I just got an unfair speeding...
May9-07 04:10 AM
11 9,385
Now somewhat near the end of Hyperspace, It spoke of blackholes and how light can't escape. Doesn't that mean that if...
Aug17-05 01:08 PM
4 2,561
Sep6-05 09:10 PM
9 5,437
OK, PF, I have an argument to settle and I need some expert advice. A friend of mine claims that it is possible to...
Oct21-13 08:49 AM
9 648
Hi there, I was wondering if you could help me with a question I have (I've posted it here as opposed to the homework...
May9-04 11:53 AM
2 1,001
Hi everyone! As Im new to this, Im not sure where I should post my question so I thought I'd give in here a go... ...
May9-09 05:22 PM
0 1,224
How is it that light disperses from a point source (like a pinhole w/ a light shining through). From my understanding,...
Dec18-09 07:46 PM
5 2,684
I am wondering... say an object was put directly on a lens and you wanted the projected image to focus at around 3 cm...
Dec19-09 04:02 PM
Andy Resnick
5 1,716
So, I've been wondering. Anyone know what shape/prescription a contact lens would have to be in order for an eye to be...
Dec20-09 06:53 PM
2 1,293
Hi All, I need help determining focal length value in a two lens system. In the set up, the light source (object)...
Mar24-13 01:18 PM
Andy Resnick
1 478
I have noticed that when I fill the 36 inch glass tube of my mercury barometer, that there are thin bubbles of air...
Feb14-14 12:32 PM
6 278

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