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Quality answers to common physics questions
T 11:39 AM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 68,300
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
168 180,165
After I comb my hair, does it supposed that my hair is positively charged and the wood comb is negatively charged?...
Mar10-12 11:03 PM
oem7110
3 2,246
Pretty sure I have some misconceptions, please correct me thanks. SHORT VERSION According to Nyquist's theory, if...
Mar10-12 09:16 AM
RobAnderson
35 4,105
The plane wave function sometimes could be represented as: U(\mathbf{r} ,t ) = A_{0} e^{i(\mathbf{k} \cdot...
Mar11-12 11:57 AM
PhilDSP
7 3,452
Hi, I have some very basic questions regarding electron energy levels/states. In the basic atom model when an...
Mar10-12 05:12 AM
cmb
27 2,542
Hello everyone, I am new here and just wanted to take this time to say hi. My name is Victor I am an automotive...
Mar11-12 11:54 AM
Jobrag
3 1,266
If a body is rotating in a circular orbit then what is the moment of net force acting on it about the axis of rotation?
Mar11-12 04:04 AM
dreamz25
11 1,180
There are two sphere of same radius but one is solid and other is hollow. Both are heated to same temperature(greater...
Mar11-12 11:00 PM
vkash
2 1,844
So we were taking measurements for an experiment in our radio astronomy lab. For the first part of the experiment, we...
Mar11-12 07:09 PM
Andy Resnick
5 2,203
Imagine an ordinary car wheel with rubber tire, installed in a car axle. So the weight of the car (some of the weight...
Mar11-12 06:42 PM
mrspeedybob
3 1,294
I know that rubber is a type of good insulator of electricity. But the problem is that we will still get shocked when...
Mar10-12 01:48 AM
math_way
7 2,635
Hello everyone, I saw this video in youtube: http://www.youtube.com/watch?v=cRJv6z_bxQg And I have some questions,...
Mar11-12 05:08 PM
dislect
2 930
A 1000-kg car moves at a maximum speed so that it does not skid off the 50-m radius level track. If the coefficient of...
Mar11-12 02:21 PM
tiny-tim
13 1,992
My book defines accuracy as the closeness of a measurement to the real/actual value, precision as when a set of values...
Mar11-12 04:12 PM
mathman
7 9,193
I think the solution I need lies within Pascal's Law, but I'm not quite sure I'm doing it right. I'm not looking for...
Mar10-12 09:07 PM
Barstowrat
6 1,508
Hello, My question is related to mathematical physics. I have solved the time-independent differential equation of...
Mar11-12 08:55 AM
decart
0 571
. My old car has a plastic fuel filter located between the fuel pump and the carburator fuel inlet. Whatever the...
Mar10-12 04:04 AM
beginner49
0 720
Hi I know what pressure and friction drag are, I am having a hard time trying to find out how can you calculate the...
Mar10-12 06:21 AM
cmb
3 873
How I am currently imagining it: In a simple circuit with just a battery and resistor the voltage of the battery sets...
Mar10-12 01:26 PM
rcgldr
2 2,229
Hi all, I have a spreadsheet which says failure will occur in my composite piece when a load of 3500 lb/in is...
Mar11-12 03:48 PM
AlephZero
5 1,147
I'm trying to understand the entry labeled 1.2.3 on this page - http://setifaq.org/faq.html#1.2.3 The main point of...
Mar11-12 08:03 PM
davenn
3 1,245
"You can drop a mouse down a thousand-yard mine shaft and, on arriving at the bottom, it gets a slight shock and walks...
Mar11-12 09:40 AM
superalias
3 1,676
What is this equation for and how is it obtained. E=6(mg/bt^3)Rs
Mar11-12 01:54 AM
Lizwi
0 686
I decided to make a couple solenoids. Not too many loops on them though as I need higher gauge wire. After getting...
Mar11-12 09:36 AM
NascentOxygen
1 737
A 1000-kg car moves at a maximum speed so that it does not skid off the 50-m radius level track. If the coefficient of...
Mar11-12 07:51 PM
davenn
1 770
Hi, I think the sample physics problem given by the ADA on their website is wrong. Can anyone confirm? It says: A ball...
Mar11-12 01:09 PM
burapi
4 797
I got a 30kg rock in space, no gravity, no friction. It is traveling at a CONSTANT speed of 100m/s. According Newton's...
Mar11-12 08:38 PM
OldEngr63
4 2,301
A different form I conceive entropy is a result of the homogeneity of space, that since some places are more ordered...
Mar11-12 02:48 PM
azabak
0 643
Ok, Please correct me if I'm wrong; Flux lines are a sort of mathematical visualisation of magnetic fields, they...
Mar12-12 03:01 AM
tiny-tim
15 1,749
How is the speed of light measured?
Mar11-12 03:19 PM
Pagan Harpoon
1 868
it is born.
Mar12-12 10:14 AM
M Quack
5 1,611
Hey, I'm having a bit of trouble with a Free Body Diagram question and I'm not sure if I'm going about it properly....
Mar11-12 07:18 PM
gbaby370
2 924
Mass of cart A: 1kg Mass of Cart B: 3Kg Spring potential energy: 24 Joules Two carts are pushed apart when the...
Mar11-12 07:32 PM
ineedhelp2395
2 893
Dear All, I am doing a project related to window fourier transform and also i am beginner to window Fourier...
Mar11-12 08:41 PM
hamidlukhnowi
0 915
It's been a while since I've done any work-energy questions, and I just noticed how vague some questions could be (or...
Mar12-12 01:40 AM
mathsciguy
2 1,383
This equation is for calculating what and how was it obtained. E=6(mg/bt3)Rs
Mar12-12 08:50 AM
sophiecentaur
1 719
I have a 100watt xenon lamp , the UV component comprises of 5-6% of the total spectrum emitted by the xenon lamp . How...
Mar12-12 09:31 AM
sambristol
1 1,738
Hey im a first year at Auckland Uni studying Physics. Does anyone have any good websites where i may find interactive...
Mar12-12 09:41 AM
anuragkanase
2 734
hello, i am writing a report on wave particle duality and i have included the experiments you would expect. young's...
Mar12-12 01:46 PM
sophiecentaur
17 1,506
Hi, I have a 3D spherical distribution of mass in polar co-ordinates. The directional cosines of any point in the...
Mar12-12 10:07 AM
Dr Bwts
0 665
Now I'm not a PMI (perpetual machine inventor). In fact I'm quite convinced that there is no such thing as that. But a...
Mar12-12 01:05 PM
berkeman
3 1,476

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