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Quality answers to common physics questions
Aug12-14 11:12 PM Simon Bridge 
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All physics courses. PDFs, tutorials and web links.
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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...
Sep5-14 05:07 PM
DennisN
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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
ZapperZ
2 71,279
i am in total confusion to co-relate p.d of electrostatic and p.d of electricity. can somebody help me out?????/
Mar1-12 03:40 PM
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Forgive the sloppy use of math and inability to produce an image. I noticed this last christmas. If you have a...
Mar1-12 03:21 PM
tiny-tim
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How do you get a high voltage, low current? This is where I am getting confused. I was under the impression, that the...
Mar1-12 01:42 PM
vkash
1 1,827
In measuring of the resistance of a superconductor, we are using a four=point probe to determine the voltage. We have...
Mar1-12 09:01 AM
gboff21
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Not sure under which forum this should have gone under, anyway can someone who really understands it explain it to me...
Mar1-12 07:48 AM
Claude Bile
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Is there any parameter that represents the chaotic-ness of a system? For example, can we show that a 4-body system...
Mar1-12 07:43 AM
Claude Bile
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Hello, I have voltage signal that is time gated up to ns. I want to integrate this signal over this time interval,...
Mar1-12 07:35 AM
MAAB
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Applying the 2nd law of thermodynamics to the whole universe is tricky, since if the whole universe would always...
Mar1-12 07:26 AM
mc^2
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I am trying to figure out what size eaves we need for our house extension. I've tried a few calculations and now...
Mar1-12 04:12 AM
sophiecentaur
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hi, i am reading this statement in a paper. but i am curious about how it is happening?? what are the reasons causing...
Mar1-12 03:23 AM
gratecircle
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how to find the coefficient between the penny on ruler when it spins with uniform circular motion. Here isthe picture...
Mar1-12 12:22 AM
hnguy038
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How do you find the heat of fusion with only solubility, MW and temperature given? These are for an anhydrous,...
Feb29-12 07:11 PM
sciencesofia
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If i use a certain amount of energy/work - lets say 0,36 J - to wind up an old alarm clock, will the mass of the clock...
Feb29-12 05:30 PM
Drakkith
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Yes, that is my problem. I could never reproduce in computer the scheme I learned in Computer Engineering graduation I...
Feb29-12 10:47 AM
castman
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Hello everybody, I have a (potentially strange) question. Let's say an electron enters a magnetic field; what...
Feb29-12 10:40 AM
granpa
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Can Power supply be smaller than power dissipated? Because I saw this in one question...
Feb29-12 09:26 AM
athrun200
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Can accelerating neutrons emit electromagnetic waves? Will neutrons absorb or reflect EM waves? If not, what would a...
Feb29-12 06:59 AM
Drakkith
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Is there an equation that deals with the dissipation of sound waves in air? As in, how much they die out with...
Feb29-12 05:47 AM
sophiecentaur
2 4,300
Hello, as I said in the title, I'm trying to re-learn physics. I say re-learn because last year when I finished...
Feb29-12 05:29 AM
Hobin
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Conceptually, what does it actually mean to take the 'moments about a point' on a body, even if that point is not the...
Feb29-12 04:57 AM
sophiecentaur
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Why is the universe a big, vacuumed space with stars and planets and gravity and dark matter? Why is there life and a...
Feb28-12 10:15 PM
DaveC426913
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So, I want attend either college X or Y; I'm using variables because I don't want to expand on the college, et cetera....
Feb28-12 10:11 PM
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I am studying a biological system comprised of roughly 10000 cells. My model studies the probability that a cell...
Feb28-12 10:04 PM
bp_psy
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I understand what a phase angle/difference is, but when it comes to applying them in questions (from past papers) my...
Feb28-12 07:50 PM
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I was reading a little about Chaos, and I realise that period doublings are the bifurcation points. What are...
Feb28-12 03:14 PM
ZedCar
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Ok I am wondering how to solve this or go about figuring it out. This is what I am trying to do. I have a 253.859...
Feb28-12 02:18 PM
cjl
7 2,078
thanks
Feb28-12 12:40 PM
DennisN
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This thought experiment involves two people named Person-A and Person-B. Person-A fires a gun from a car which is...
Feb28-12 12:26 PM
forumsuser
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There is a gummy bear stuck to the ceiling where I work. When it hit the ceiling, some of its kinetic energy would be...
Feb28-12 11:53 AM
seekingtuva
2 964
my friend and i are doing a DP lab, we are trying to find a resister which reacts to water/ moisture in soil. a...
Feb28-12 09:40 AM
Andy Resnick
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I have a hemisphere dome, which volume = \frac{2}{3}∏r3 Inside the dome, pressure is 1atm (assume 1.05 kPa) Outside...
Feb28-12 08:13 AM
Hobold
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my husband has a van de Graaff generator and one day he decided to bring it out and show me since i had never seen...
Feb28-12 07:44 AM
Deamonisi
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Please help me in removing my mistake, since i see 3 satellite required to locate an place on earth and...
Feb28-12 07:38 AM
rajeshmarndi
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Q. A spring balance read 10 kg when a bucket of water is suspended from it. An iron piece having some mass is...
Feb28-12 05:15 AM
rishch
2 1,490
Hi, sorry if this is in the wrong forum. I have a physics problem I do not understand: Jim is removing a piece...
Feb28-12 01:13 AM
indieindie85
1 1,008
During one of my labs we were using circuits. I connected a 9V battery in parallel with a 2.kΏ resistor and a...
Feb28-12 01:09 AM
maimonides
11 1,739
I would like to get some profesional advice from you all on how to calculate an object distance from camera using the...
Feb28-12 12:40 AM
sakurarandom
0 2,099
So, I'm not in any way trained in any type of physics...so I'm sorry for the very basic way of explaining my question....
Feb28-12 12:19 AM
Drakkith
4 935
Hello, I'm looking for a college that offers Physics 4C(or equivalent classes) in this coming summer in CA or nearby...
Feb27-12 10:55 PM
18376935
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So I'm sure everyone here knows of the basic spacial dimensions. 1D is a line, 2D a plane and 3D a cube. There is even...
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SHISHKABOB
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