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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
168 190,840
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 70,629
There are 'four' experimentally proven dimensions. Anything and everything must be defined by 'four' dimensions. It...
Sep29-09 05:29 AM
xxChrisxx
9 1,107
Hi I'm trying to build a permanent magnet alternator with a different approach than usual. Most PMAs have a ring of...
Sep28-09 09:45 PM
Bob S
1 13,977
Today I was doing a homework that asked me to calculate the sum of some particular tangential acceleration and radial...
Sep28-09 09:37 PM
Gear300
4 1,295
How can you argue, by symmetry, that the vector potential inside a solenoid depends only on \rho, the perpendicular...
Sep28-09 07:04 PM
diazona
3 2,315
Hi I was just wondering if a body can have potential and kinetic energy at the same time? Say there was a knife on...
Sep28-09 06:21 PM
russ_watters
3 1,799
I have a few questions on the Photoelectric Effect. First off, what wavelengths could be used to cause a...
Sep28-09 02:24 PM
DeShark
6 1,467
Hopefully i am not wasting anyones time, as i dont know alot about sound waves etc.. but i was wondering if anyone...
Sep28-09 01:21 PM
Bob S
5 950
Hi! a very simple question: I know the difference between velocity and speed. I would like to know if there is an...
Sep28-09 09:58 AM
dx
5 1,447
Is iron electric conductor also when it's molten?
Sep28-09 07:11 AM
Dadface
1 1,073
Assuming a machine such that it produces blocks of negative and positive mass from vacum, and it uses the produced...
Sep28-09 05:32 AM
russ_watters
4 1,481
How would you write an infinite line charge with constant charge per unit length \lambda as a volume charge density...
Sep28-09 01:19 AM
Born2bwire
1 1,968
A block of mass m is on an inclined ramp. The coefficient of static friction between the block and the ramp is Ás. ...
Sep27-09 10:54 PM
Stride
1 2,824
Stupid question, but Im no Einstein. So why do all the bodies have it? Does enegry also have it? What's it caused...
Sep27-09 10:29 PM
DaveC426913
14 2,330
I'll ask this in the form of an example. A bus is traveling at some speed and there is no wind. The bus experiences a...
Sep27-09 07:12 PM
rcgldr
0 653
Hi , I would like to know if a photo chemical reaction taking place within a closed container would stop once a...
Sep27-09 07:44 AM
photonfree
0 924
Suppose an object is moving toward the Earth(with a direction perpendicular to the Earth's surface) at an initial...
Sep27-09 03:30 AM
Repainted
0 2,133
So after swim practice I was waiting for my ride and pondering the universe. I was thinking about the Earths orbit...
Sep26-09 09:09 PM
Doc Al
8 1,421
Hi guys, I recently purchased some LED strip lights for my car (like this -...
Sep26-09 05:12 PM
Danger
3 4,009
I was wondering if someone could answer a question for me. If you had two objects in space X distance from each other,...
Sep26-09 05:00 PM
Integral
6 1,798
just a quick question.... (not a HW question) i know that when you do multiplication/division between numbers you...
Sep26-09 03:43 PM
Redbelly98
3 1,209
I'm trying to do this demonstration for a high school class: Using different shapes of "boats" I'm going to...
Sep26-09 03:33 PM
Andy Resnick
1 1,468
Sorry for asking this dumb question. The units for displacement is m. The units for velocity is m/s. The units...
Sep26-09 02:40 PM
Doc Al
2 1,083
How do we know that energy behaves the same way in higher dimensions as it does for 3-dimensions? With a higher...
Sep26-09 01:54 PM
Gear300
0 752
I know that a vector has magnitude and direction. But what about its components? Are they still considered vectors?...
Sep26-09 01:10 PM
mikelepore
1 909
...or something else? thank you. -- faye kane, idiot savant
Sep26-09 12:12 PM
Vanadium 50
1 1,345
I am confused regarding the heat properties of electromagnetic radiation. Wiki states "Any electromagnetic radiation...
Sep26-09 09:35 AM
Redbelly98
4 1,603
I'm currently working on a new paper on how to increase the efficiency of space rockets (both in performance speed and...
Sep26-09 09:08 AM
ZapperZ
6 1,727
This may very well be an elementary question but I need to know once and for all. Do photons have mass and how is it...
Sep26-09 06:10 AM
Bob_for_short
2 813
Hi everyone, first time poster. Considering some of the things discussed here, I apologize if my question sounds...
Sep26-09 03:31 AM
sskkambad
3 4,389
Dear physics friends: I am using a Potts model to study protein folding. In short, the partition function of the...
Sep25-09 07:34 PM
Phyisab****
9 6,537
hello my question is why glass is transparent why the photon are traveling in it with out being absorb use...
Sep25-09 06:07 PM
hagopbul
6 1,150
I was wondering, when planes are flying at an altittude of 10km above sea level,, does the earth's rotational spin...
Sep25-09 10:09 AM
Cleonis
17 6,971
Since the SABLE project broke on slashdot and youtube, I've been kind of keeping an eye on the tech, and science these...
Sep25-09 08:32 AM
Cleonis
2 999
In a generic case of a mass point and an extended body to interact with gravitational force, the total force on the...
Sep25-09 07:39 AM
Andy Resnick
3 1,543
(Please make it a bit easy for a newbie student) Law of Conservation of Energy states that energy can neither be...
Sep25-09 07:33 AM
Andy Resnick
4 1,394
Hi, I think I can relate the mathematical operation (+) to a physical entity. Lets say we know for mass it makes...
Sep25-09 06:08 AM
thedy
21 4,159
hey, i'm 15 years old, and i'm still going to high school:) But Physics has been my main subject of study for a few...
Sep25-09 03:13 AM
daveg360
24 1,873
So there's this guys argument that newtons 3rd law is wrong: "When I say that for every action there CAN'T be an...
Sep25-09 01:46 AM
srvs
17 4,859
I have heard that the speed of light remains c even if it is not in a vacuum. the light bounces around in the...
Sep25-09 01:29 AM
raphael3d
9 1,597
Hello, Quick question. This is a light wave http://science.hq.nasa.gov/kids/imagers/ems/ems.gif This is...
Sep25-09 01:20 AM
bjacoby
5 3,537

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