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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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While 1D logistic growth model (when a continuous ODE describes it) can't show chaos, when written as a discrete-time...
Nov1-12 03:14 AM
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First , elementary particles traveling through vacuum , do they experience any loss of kinetic energy or whatever or...
Nov1-12 03:09 AM
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9 928
What is the Application of xerography ??? I mean on what principals does the photostat machine works...
Nov1-12 03:04 AM
AJ Bentley
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Does anyone know how to derive the relationship between acoustic impedance and sound pressure for spherical waves? ...
Oct31-12 09:15 PM
zewei1988
0 670
In chemistry I remember learning that electrons and protons had equal but opposite charges but also that electrons...
Oct31-12 04:47 PM
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Hi people, I'm new here, so, if there's anything wrong with my post, please tell-me =) So, if we have a recipient,...
Oct31-12 03:09 PM
Ibraim
2 1,135
Hi, I've been trying to understand electricity... and series of questions came into my mind.. 1. I know if i move a...
Oct31-12 02:40 PM
Drakkith
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hello! in a system in void oscillates (eg a mass tied in a spring, whose other edge is fixed) we say that if we...
Oct31-12 01:43 PM
mather
4 1,295
I need help finding some animals whose application of physics in the nature have inspired people to use the same...
Oct31-12 11:49 AM
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The concept of diffusion is confusing me, as it seems to contradict gravity. x = particles of matter with a mass of...
Oct31-12 10:12 AM
AJ Bentley
1 431
I have to build a t-shirt launcher as an engineering project using only mechanics, no pneumatics or pressurized air....
Oct31-12 08:55 AM
AJ Bentley
1 1,174
I am really finding it hard to work out Young's Modulus. I have my stress / strain graph I was told I should...
Oct31-12 08:51 AM
AJ Bentley
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Could temperatures at a fraction of a kelvin be dangerous? We have only naturally observed temperatures of 1k But...
Oct31-12 08:46 AM
AJ Bentley
8 870
Hi Could somebody please tell me what this is? It stands about 1/3 M high, has a spout just above the larger bottom...
Oct31-12 08:30 AM
AJ Bentley
6 654
Hi, I am an EE studying some plasma physics. I am doing alright with it, but this question cropped up in my head a...
Oct31-12 07:53 AM
AJ Bentley
1 530
Hi! I have the following problem: the optical tweezers attract beads but when the beads get to the trap, they are...
Oct31-12 06:37 AM
Fioda
4 667
Hey everyone, I have a question from a past exam paper that I was doing. I spent a lot of time trying to solve it,...
Oct31-12 03:31 AM
manojr
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What prevents helium from becoming solid at normal atmospheric pressure? All other elements are solid at 0K, why does...
Oct31-12 01:57 AM
snorkack
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This site was at the top of the Google results for "How efficient is a microwave oven" I can't restart the old...
Oct30-12 04:51 PM
sophiecentaur
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Metals have the low specific heat capacity.why is the low specific heat capacity useful?
Oct30-12 04:20 PM
0xDEADBEEF
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Hi , if we have a rotating centrifuge at rpm "a" and we have the radius "b" of the centrifuge and then at the side i...
Oct30-12 03:51 PM
Crazymechanic
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Hello, its my first post here, I had physics long time ago and now composing a system which need some (only...
Oct30-12 11:32 AM
Psionic86
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I need help finding some animals whose application of physics in the nature have inspired people to use the same...
Oct30-12 10:39 AM
sophiecentaur
2 781
This is regarding youngs elastic modulus I need help as I am trying to figure out the stress and strain of an elastic...
Oct30-12 10:10 AM
nasu
6 2,553
For example, if you have really large pond and a small pond, and you swim down 3 meters in each of them, the pressure...
Oct30-12 09:38 AM
A.T.
9 1,083
I've been reading up on radiation and it appears to me that if you add up all of the protons, neutrons, and electrons...
Oct30-12 08:39 AM
harrylin
27 2,921
I was looking at the mass-energy relationship equation, which by taking the derivative I would think that you you...
Oct30-12 05:34 AM
russ_watters
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Can anyone think of two distinct ways which the Schrodinger model of the atom improves upon the Bohr model of the...
Oct29-12 10:27 PM
jtbell
2 4,050
Let's say we have a radio wave coming into a receiver. When the phase is near 0, does this mean that fewer photons are...
Oct29-12 08:21 PM
Drakkith
30 1,747
Hi there , I have been trying to work out what the speed of sound is when passing through a metal alloy made out of...
Oct29-12 07:44 PM
Astronuc
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Hello friends... Please answer to this question… Any system always prefers a lowest energy state. Why??? Does this...
Oct29-12 07:36 PM
Drakkith
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In other words, in terms of science, is there a category that has both antimatter and matter in it?
Oct29-12 06:49 PM
sophiecentaur
7 709
Hi, The Universe in 14 billion years old. Is that then: 14,000,000,000,000 or 14 million million as in...
Oct29-12 05:49 PM
Ryan_m_b
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Today I stumbled on a paper in Foundations of Physics that seems to successfully extend SR to include effects from...
Oct29-12 03:09 PM
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4 922
If spin particles are in \vec{B} = 0, then is it impossible to determine their magnetic moment at a given time given...
Oct29-12 12:36 PM
Vanadium 50
1 431
Hello everyone, I'm an optometry student who is currently doing Optics 1, and I have a general question about focal...
Oct29-12 12:09 PM
lightarrow
6 1,042
Lets take visible light for example. The frequency/wavelength determines the amount of energy and the type of...
Oct29-12 11:48 AM
sophiecentaur
4 2,259
If the Earth was to be shrunk to the size of a small particle (around the size of *10^-11m) how would the properties...
Oct29-12 11:28 AM
Ryan_m_b
1 539
I get a problem ,my university professor for physics 1 ask me to search about work of odometer in physical view ,I...
Oct29-12 10:00 AM
rcgldr
1 958
Hi, I know potential = mgh where g can be considered constant close to the surface of the Earth. So as we move away...
Oct29-12 09:49 AM
rcgldr
4 1,182

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