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Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people...
Apr22-11 05:26 AM
ZapperZ
1 41,742
Hi! I'm a new user of this forum, although i've been reading a few threads for a while... Mi question is this: in...
Apr16-09 06:47 AM
laharl88
5 679
If there's a point charge at the origin, I want to find two closed surfaces such that the flux through one of them is...
Apr16-09 06:35 AM
dx
1 618
is it possible to convert internal energy into mechanical energy? is there some real life example which can explain...
Apr15-09 09:04 PM
maverick_starstrider
2 701
Hey all, First off, thks to everyone here on physicsforums, this is such a great resource for anything...
Apr15-09 08:55 PM
DaleSpam
14 1,710
If an object slides down a slope at a constant speed is the coefficient of static friction the same as the coefficient...
Apr15-09 02:26 PM
rcgldr
4 2,092
Consider this situation. A non-rotating wheel is cruising through space such that its velocity vector is at some...
Apr15-09 02:13 PM
rcgldr
14 1,686
This is more of an automotive question I guess but anyways: I'm pretty familar with how torque and horsepower are...
Apr15-09 01:28 PM
Bob S
3 843
Newton's Law of Cooling Time Required to Cool (or heat) an Object t=mCp(Ts-Tf)/Q Where; Q is the heat...
Apr15-09 01:18 PM
Bob S
1 2,238
Consider a plane wave f = cos(kz - wt). Applying Maxwell's equation (divE=0 in vacuo) gives kcos(kz - wt) = 0 which...
Apr15-09 08:55 AM
madness
3 1,122
I have found this fantastic calculator: ...
Apr15-09 08:42 AM
mgb_phys
1 1,137
Ok. Folks, first off this is my first post, and I am looking for some answers to some questions I have. I hope...
Apr15-09 08:17 AM
mgb_phys
3 986
here is the bull thing... now im sitting on my chair and i know earth exerts a force on me which is called my...
Apr15-09 06:09 AM
Borek
28 2,204
heat provider and heat acceptor makes up the system. heat flows from high temperature to low temperature. the...
Apr14-09 08:52 PM
JesseM
10 1,026
Hi, I am trying to solve the following problem (but note you can skip the details and look at the last equation and...
Apr14-09 04:19 PM
Cantab Morgan
13 2,209
I was thinking a lot, so it'd be great if you could help me. What equation describes a magnetic induction line??? (I...
Apr14-09 03:04 PM
Kolobochka
0 3,623
I have been trying to solve this problem without any success. Not homework, just curious how to solve this, I'm trying...
Apr14-09 01:42 PM
quantoshake11
1 996
I am a basketball player. how would I solve for the force needed to propel my 160 pound body(simplifying my body into...
Apr14-09 01:39 PM
quantoshake11
10 820
If I shoot a ball out of a cannon with muzzle velocity of 100 fps at 45 degree angle, how do I compute how far I shoot...
Apr14-09 11:48 AM
ApuroopS
14 1,103
a charged particle ( say 'q' ) moving with velocity 'V' in a region containing a magnetic field 'B' experiences a...
Apr14-09 11:29 AM
Bob S
2 1,148
Can anyone suggest where I can geet data on hockey composition - I have been everywhere Thanks Liz
Apr14-09 08:54 AM
xxChrisxx
4 1,072
Hello everyone, I am trying to test the collimation of light emerging from an off-axis parabolic mirror. My mirror...
Apr14-09 07:39 AM
Andy Resnick
3 1,500
I am attempting to derive the equation for dampened harmonic motion from the differential equation: m\frac{d^2...
Apr13-09 04:25 PM
arildno
10 2,374
what are electric and magnetic fields? i know that theyre constant exchanges of virtual photons but what properties do...
Apr13-09 02:00 PM
cabraham
10 1,176
I do understand the definition that their initial phase different is not constant. but i just cannot imagine what kind...
Apr13-09 10:00 AM
Andy Resnick
4 4,413
I am looking for a reference (derivation) for this exact formula given for "the magnetic field due to a dipole \mu...
Apr13-09 07:32 AM
jtbell
1 2,869
Hi there, I am dealing with an inelastic, collinear momentum exchange of the form: m1v1+m2v2=m1u1+m2u2 where...
Apr13-09 01:07 AM
Quant ummm?
3 748
Dear forum users Firstly, I wanted to post in the General Physics area, but it wouldn't let me create a new thread...
Apr12-09 05:45 PM
Fullperson
3 9,119
How much salt per quart does it take to raise the temperature of water to 325 degrees at 28 PSI? I am sorry to say...
Apr12-09 04:07 PM
alxm
3 5,541
I jump off a high bench (5ft high) to the ground. What is the g-force of the impact and how do you calculate it. It...
Apr12-09 03:58 PM
joec_49
7 12,174
How do you know how much voltage is deadly without knowing the actual current? For example, a stun gun generates a...
Apr12-09 12:53 PM
b.shahvir
4 1,968
I was wondering if it was possible to bend a beam of light with a magnet. If this is possible could someone tell me...
Apr12-09 12:11 PM
Born2bwire
36 23,101
When a conductor is made to experience a field, there's a separation of kernels and electrons...now depending on the...
Apr12-09 06:31 AM
dE_logics
3 1,619
Electrical permittivity...in mathematical terms, i.e I need the derivation...WITHOUT using 'curls'. Didn't find...
Apr12-09 06:09 AM
b.shahvir
6 1,527
A source states "Electric flux = q coulombs" While another states "We choose the number of field lines starting...
Apr11-09 12:32 AM
dE_logics
2 988
http://www.turboimagehost.com/p/1595403/untitled.JPG.html http://www.turboimagehost.com/p/1595403/untitled.JPG.html...
Apr10-09 10:40 PM
cavemen
9 1,432
Why would an electric device (lets say a widget maker which creates widgets by using air and trace elements inside the...
Apr10-09 06:18 PM
russ_watters
1 765
Firstly, I'd like to announce that this is not a homework question, it is an example of a problem I thought up to...
Apr10-09 04:24 PM
arildno
3 1,928
why cannot time be considered negative at times,the past can be represented using time as a negative entity.we have...
Apr10-09 02:00 PM
Nick89
9 1,386
I have a question in regards to using gas to operate a closed system, To utilize the kinetic energy of the gas...
Apr10-09 11:45 AM
Bob S
2 943
I was reading this very small section in my physics book and cant seem to come to grips with its concept. It starts...
Apr10-09 02:56 AM
arildno
6 2,755

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