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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
168 190,423
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 70,486
Can anyone tell me why net Force of x-component = -f(k) in a moving puck? I don't get how the net Force of...
Oct2-09 08:33 PM
Doc Al
3 1,380
a few questions for my own research (not too sure how to ask): maxwells equations predicted that the speed of light...
Oct2-09 07:55 AM
crockman1
10 2,020
I'm having trouble understanding the concept of a force table affecting the results of a equilibrant vector/string...
Oct2-09 05:31 AM
tiny-tim
1 2,184
Hello, In science there are so many equilibrium concepts. Pressure, electricity ,concentration..... Everything...
Oct2-09 03:07 AM
sameeralord
8 2,738
You have a glass of water on the first floor. You are on the second floor with a very long straw. You put the straw in...
Oct1-09 10:29 PM
russ_watters
9 1,134
In regards to data analysis, what would it mean if you measured some quantity, say the speed of light for example, and...
Oct1-09 10:04 PM
Bob S
1 1,152
From my observation I saw that the temperature goes up immediately after rainfall. Then it gradually cools down. I...
Oct1-09 09:48 PM
willem2
2 2,556
I know how to find a torque at any one point, and about the x,y, and z axis. General equation is t = n dot (r X F)...
Oct1-09 09:32 PM
willem2
1 2,158
What are some ways to evaluate an object undergoing unconstant acceleration?
Oct1-09 07:37 PM
xxChrisxx
2 1,094
Okay, this stems from a physics argument we had in class today; everyone in the arguement (my teacher included),...
Oct1-09 03:18 PM
D H
8 2,028
I was under the impression that energy had to be positive. Yet it seems we are still forced to use negative energies...
Oct1-09 03:09 PM
DaleSpam
6 770
My project is to build an efficient pendulum that hold 75% of its amplitudeafter 1 minute. What are some things that...
Oct1-09 02:43 PM
Bob S
2 821
Hi, if say you are determining the speed of sound and you want to compare your values to the theoretical value, would...
Oct1-09 01:22 PM
Bob S
3 11,554
Very simple question but it has really been bothering me lately. Recently, a professor asked us this in class to which...
Oct1-09 01:06 PM
Bob S
9 3,697
Hello, We all know that if you compress air the pressure and temperature increase together. But how can I...
Oct1-09 12:47 PM
matthewgill
4 13,976
This is a very old topic that I wanted to "publicize". My contention is that you cannot use power to calculate...
Oct1-09 09:00 AM
dehseth
24 11,027
"I pour hot water into a metal container. The inside surface of the container gets hot." It is quite clear the...
Oct1-09 07:25 AM
Mapes
4 1,100
Hello I have used the Mercury intrusion porosimetry equipment to determine pore diameter range of porous...
Oct1-09 05:32 AM
Msl
0 1,214
I'm not sure if I understand what energy really is but it seems to me that energy should be just the force that moved...
Oct1-09 03:37 AM
ZapperZ
23 7,330
I have joined this forum in need of some help. I am poor at physics but not too bad at math. I am making a device to...
Oct1-09 01:13 AM
nidhi.monika
9 13,808
Ive been thinking about comments made by Fra in a number of threads, where he raises questions like what does an...
Oct1-09 12:25 AM
apeiron
35 5,383
Dear All, Can anyone inform me the following things on urgent basis ? - The crystal structure of Bi2Te3 is...
Sep30-09 11:46 PM
mahedi
2 918
Even though Bohr's model is defunct, one important element of it survived, namely the strictly quantized orbiting...
Sep30-09 08:06 PM
planck42
4 1,158
In what medium do light, energy, and matter exist? I'm wondering what medium, material, substance do light, energy,...
Sep30-09 05:35 PM
DaleSpam
3 1,263
This is a real-world problem - NOT AN EXAM OR HOMEWORK (although it may sound as if it was produced by a deranged...
Sep30-09 04:48 PM
Cleonis
18 2,963
Is there such a part that when it hears a particual sound, that it only recognises this sound. let me explain... ...
Sep30-09 03:23 PM
FredGarvin
7 866
http://www.youtube.com/watch?v=wOd6o9Fv8TM This is a game called Gran Turismo 5, which is still under development. ...
Sep30-09 02:39 PM
James Leighe
4 1,207
Hello dear scientists, I was wondering if it's possible to create a room with a stronger gravitational force,...
Sep30-09 11:00 AM
gloo
8 1,393
Hey ya, Well, I have been having a difficult time finding the answer to this question, probobly because I dont know...
Sep30-09 08:47 AM
TjFitz
7 3,812
If I want to find A relative to B, what am I really looking for? Am I assuming that A is fixed at the origin and...
Sep30-09 12:26 AM
diazona
1 3,039
My question is as follows: Do we (and all stationary objects on the surface of the earth) make up for the overall...
Sep29-09 08:36 PM
DaveC426913
17 2,111
Hi all, I was wondering how to calculate the moment of inertia of a cylinder that is filled with a substance and is...
Sep29-09 06:09 PM
asinewave
3 3,410
Silly question perhaps but I was thinking.. Shouldn't there in theory be a round light of the moon and then complete...
Sep29-09 04:32 PM
russ_watters
1 1,283
Hey, First off note, I did not see the movie yet (so please don't spoil any of it for me :p ), I am merely talking...
Sep29-09 03:59 PM
Sir_Viking
21 5,108
Hi, I have already made a post, which did help (so thanks all for repling) but I am trying to conduct an experiment,...
Sep29-09 03:02 PM
callumbrad128
4 2,011
I wonder about gravitational interaction between two bodies of any shape (not necessarly symmetrical). I would like...
Sep29-09 09:54 AM
Doc Al
3 820
Suppose they're separated by a distance d and have thickness D. One has charge Q, the other has charge -Q. Why can we...
Sep29-09 09:04 AM
vanesch
1 1,590
so far i've been studying that P= work done (energy change) / time = I x V and its all been good... until i came...
Sep29-09 08:44 AM
Gear300
1 1,122
Recently, I purchased a pair of glasses from a privately owned optic store. I specifically asked for hi-index lens...
Sep29-09 07:51 AM
Andy Resnick
1 1,269
Hi, In the study of the greenhouse effect, I know for a fact that short wavelength radiation pass through a glass...
Sep29-09 07:36 AM
klng
3 2,823

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