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- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people...
Apr22-11 05:26 AM
ZapperZ
1 47,834
Consider a wire, if I suddenly pass current on it. There would be an instant localized B field around the wire. Since...
Apr4-08 07:58 PM
enroger
4 957
In school yesterday I was doing a practical and when I moved a small 1.5T block magnet near a rheostat the magnet...
Apr4-08 05:21 PM
lugita15
1 1,261
Im studying for the Fundamentals of Engineering exam (coming up April 12!!) and came across this Thermodynamics...
Apr4-08 01:04 PM
Mapes
1 1,094
I wanna know if in rapid adiabatic compression of a gas, is work done by gas on surrounding (atmosphere) numerically...
Apr3-08 11:07 PM
zarbanx
14 3,006
Hi all, One idle night a friend and I started an argument over the question: "How much energy is imparted on to...
Apr3-08 06:06 PM
seycyrus
12 9,237
I know that as temperature increases the extension of a material under a specific load increases too, but what is the...
Apr3-08 12:00 PM
Andy Resnick
1 1,197
Hoping that someone on this forum can help me with this problem that has been stealing my sleep at night:rolleyes: ...
Apr3-08 11:13 AM
jacob_yukon
0 635
Do electrons flowing in a circuit perform work with their mass (or kinetic energy)? For example like a water flowing...
Apr2-08 10:44 PM
Snazzy
32 6,883
If you have the primary and secondary coils of a transformer next to each other, then current will induce a voltage in...
Apr2-08 03:13 PM
TVP45
3 1,003
if a system of particles is composed of n freely moving particles .is the mass of this system qual to the sum of the...
Apr2-08 01:41 PM
tarekkkkk
2 893
If you combine many small magnets together in a cube or spherical shape (say those 1.5 tesla rare earth magnets), is...
Apr2-08 10:03 AM
clem
4 1,233
I am a beginner in thermodynamics. I was going through a educational board's chapter on thermodynamics. I want to...
Apr2-08 08:05 AM
Andy Resnick
2 1,078
So, I am looking a question about adiabatic expansions and the associated entropy changed. Why exactly is the...
Apr2-08 07:46 AM
Mapes
4 1,055
I was just wondering, since my textbook doesn't really explain it too well, what velocity is part of the equation F =...
Apr2-08 02:16 AM
Feldoh
13 2,082
When dealing with system containing millions of particles( for example, charged particles or magnetic particles) with...
Apr1-08 07:36 PM
pam
1 1,030
Hi there, I'm working on some experiments regarding to gases. I want to know what'd happen to gas which is uneder...
Apr1-08 04:16 PM
russ_watters
9 2,807
The flux rule states that the emf induced in any loop is given by the rate of change of magnetic flux through that...
Apr1-08 03:00 PM
lugita15
4 2,138
Hi! Can some one give me a link where i can find details about finding the velocity of propagation of a mechanical...
Apr1-08 12:17 PM
Andy Resnick
1 2,356
magnetic field forms closed loop always. So, it should be called a non-conservative force. But if a charged...
Apr1-08 11:41 AM
i_island0
12 3,039
A revolving satellite is similar to a lift which is falling from a height. Only the difference is that the satellite...
Apr1-08 11:23 AM
YellowTaxi
6 1,524
Hi, If I were to bring a magnet (just 1 mm long) close to a hypothetical "magnetic" black hole - something that has...
Mar31-08 03:41 PM
rsr_life
0 1,838
This question came some time back in Stony Brooks exam. I have the solution also. But i am having some conceptual...
Mar31-08 03:02 PM
zarbanx
2 10,341
Hi, When a gas is compressed, its temperature increases. But what is the formula to calculate this rise? Could you...
Mar31-08 02:38 PM
zarbanx
3 17,050
Hi there, I am developing a really cool new product and it somehow relates to pressure's behavior. Since I do not...
Mar31-08 12:26 PM
marcusl
1 1,004
Hi, I am wondering if anyone here has a way to calculate the surface temperature of an object as it gets hit by a...
Mar31-08 10:57 AM
fair001
9 3,629
Hi, I'm looking at finding a way to determine when a stream of water of a certian diameter coming from a hole at a...
Mar31-08 08:17 AM
Andy Resnick
2 1,848
When I do some physics derivation, I find that on a seesaw, if the object is farther away from the fulcrum, the...
Mar31-08 05:10 AM
Doc Al
5 3,401
As part of my project I want to calculate the theoretical value of the best thickness of cladding to use on my...
Mar30-08 07:45 PM
Claude Bile
15 1,870
if F is any function and H is the hamiltonian, then the Poisson Bracket of F and H, is given by: = dF/dt -...
Mar30-08 04:34 PM
George Jones
2 892
Hi, I'm looking for some help in calculating the amount of force from natural gas exploding. Part of the problem is...
Mar30-08 04:26 PM
Lojzek
1 778
Now suppose we have two conductors A and B. A has a charge of +2 and B has a charge of +8. If we let the two...
Mar30-08 01:56 PM
DaleSpam
5 1,184
I am having a problem with some thermodynamics calculations. I am not very experienced with them and it certainly...
Mar30-08 12:49 PM
lilrex
0 932
Hello I attach a question (PDF-file) which I found in an old physics book, I printed the question and re-generated...
Mar30-08 10:48 AM
Lory73
4 1,023
Question on Magnetic polarization Is it possible to hear/record the sound created by the shifting of the alignment...
Mar30-08 10:15 AM
Lojzek
1 986
Many of us have seen how to find a vector satisfying the following conditions (i) magnitude is m (ii) makes angles...
Mar30-08 07:26 AM
mr.survive
13 8,174
Well, I think this one is pretty simple, but still, I don't know how to solve it. We all know that for uniform...
Mar30-08 06:58 AM
mr.survive
3 935
It's widely known that the electromagnetic wave equation admits of time-advanced as well as time-retarded solutions,...
Mar29-08 09:32 PM
DaveLush
0 543
I am writing an essay in which I try to describe Centripetal Force to a layperson. Since I am a layperson myself, I...
Mar29-08 07:32 PM
Hootenanny
11 2,561
If F denotes the central force and is given as the inverse of the square distance F=-k/r^2. where k>0. How can i show...
Mar28-08 09:24 PM
Shooting Star
1 951
My professor brought this up in class the other day, but has yet to elaborate on it and i can't stop thinking about...
Mar28-08 01:28 AM
harshant
6 2,824

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