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Classical Physics

- 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 46,618
When you have a wave in sound inside a piston of length L, A.P. French says that the fundamenal frequency \nu of an...
Sep5-09 01:11 AM
WiFO215
1 529
In the Spanish second edition of "Electricity and Magnetism", Berkeley Physics Course, volume II, page 27, Purcell...
Sep4-09 05:14 PM
fluidistic
3 1,638
I've just learned by chance about http://en.wikipedia.org/wiki/Earnshaw_theorem which states that point charges cannot...
Sep4-09 05:13 PM
fluidistic
2 550
While introducing negative feedback, my book gave the following example: Let the signal voltage be 101mV and the...
Sep4-09 12:36 PM
Bob S
3 905
I'd appreciate any comments regarding the following prosaic/practical questions on inground swimming pool water...what...
Sep4-09 11:07 AM
Naty1
3 1,437
Hi! Suppose I have a wire with a potential difference V=bx where b is a constant. Then there is an electric field...
Sep3-09 11:41 PM
Born2bwire
5 2,330
How physics works when falling ELASTIC ball hits 45 degree slope? At point of colision what forces are working? As...
Sep3-09 10:56 PM
rzarx
3 1,339
Why does a non head on collision between objects with momentum and an object without momentum result in a 90 degree...
Sep3-09 09:00 PM
shredder666
6 1,474
Hi there, I don't understand why the equal of Newton's law of gravitation F = Gm1m2/d(squared) is different for no...
Sep3-09 03:38 PM
Naty1
6 1,832
The classic explanation I remember from school days regarding potential energy went along the lines "If you carry a...
Sep3-09 11:19 AM
Cleonis
6 936
Hello, I have been interested in the problem of diamagnetic levitation where you have typically 2 slabs of some...
Sep3-09 10:27 AM
moejoe
1 911
Suppose a charged particle is placed in a spherical shell so that E inside=0 which give V const. Now if i place...
Sep3-09 06:07 AM
eoghan
1 558
Hello. This is my first in here. I am studying on Physics electricity and magnetism. While I am reading the...
Sep3-09 04:58 AM
espen180
12 1,798
When a DC flows through a wire, does the electric field vary? If a changing electric flux produces a magnetic field,...
Sep2-09 09:25 PM
user111_23
1 555
I just want to get my head straight on something with regards to relativity and gravity - I think it's a simple...
Sep2-09 05:12 PM
Cleonis
5 814
I've done an exercise that made me think a bit. Here's it is : http://www.physicsforums.com/showthread.php?t=333608....
Sep2-09 05:04 PM
fluidistic
0 569
friends, there is no charge inside a conductor or to put in a better way " why electric charge resides only on the...
Sep2-09 11:40 AM
Count Iblis
18 5,407
Hello, I want to simulate a plane thin rectangular board attached to one spring below at each end. (So there are 2...
Sep2-09 07:51 AM
pL1
3 1,108
Just a couple of simple questions. 1-Why does electricity kill? 2-What causes a magnet to be a magnet and certain...
Sep2-09 07:38 AM
Andy Resnick
9 4,243
if E=-curl of V, E is vector quantity(3 components) & V is scalar quantity (1 component) then how can one function...
Sep2-09 03:45 AM
Born2bwire
5 818
like the divergence of a charged particle (whether + or -) Is there any possibility of presence of curl of elctric...
Sep1-09 11:45 PM
creepypasta13
4 1,808
I've attached a PDF file to this thread, it's a derivation and it's not working out as thevenin said.
Sep1-09 10:55 PM
dE_logics
2 950
When a string, fixed at both ends, has a force exerted on it, how do you determine what the amplitude will be, if the...
Sep1-09 10:31 PM
staticd
2 3,379
"At resonance frequency, the circuit impedance is maximum. It is resistive and its value is given L/Cr..." The book...
Sep1-09 06:22 PM
uzair_ha91
3 1,474
A bar magnet is being pulled away from one end of a solenoid, eg N pole of magnet nearest to solenoid. I've learnt...
Sep1-09 01:53 PM
cabraham
15 4,684
I have found a possible mistake in my book....here's the text which contains it, "Referring to figure, it can be...
Sep1-09 11:32 AM
Bob S
1 1,901
I am studying compressed air flow through a valve at a high pressure differential (3000psig to atmosphere). The air...
Sep1-09 08:17 AM
stewartcs
6 1,512
Speed = distance/time and current = charge/time. Explain how F=BIl is actually the same equation as F= Bqv but...
Aug31-09 09:56 PM
Born2bwire
4 896
Okay, if we have a parallel plate and we force a negative charge to the negative plate and a positive charge to the...
Aug31-09 09:23 PM
uzair_ha91
9 1,204
I am trying to understand how the Eddy current pendulum works. I know that the changing magnetic field will generate...
Aug31-09 07:12 PM
ajclegg
2 3,682
http://img136.imageshack.us/img136/5782/image64.jpg In this graph, the curve of current is larger than that of...
Aug31-09 04:05 PM
Bob S
6 1,101
If I have homogenuous function f(x,y,z,...) of degree r than: x\frac{\partial f}{\partial x}+y\frac{\partial...
Aug31-09 11:38 AM
Tobiasz
4 1,013
I know this may sound strange. Has anyone ever successfully created a working physical model of a magnet that exhibits...
Aug31-09 09:47 AM
Naty1
2 3,966
Moderation Note: Split from the original thread, which can be found here A uniform field does not have potential...
Aug31-09 05:12 AM
Doc Al
61 2,679
I've looked for this subject but perhaps I'm asking the question the wrong way. Please advise. Is there an extension...
Aug30-09 07:48 PM
kennedyusa
2 977
Hi I have a question I need help with. Im trying to find out how much forces that a pouch (balloon) creates on...
Aug30-09 06:26 PM
Astronuc
3 698
we know...when a source is running towards the listener...the wavelenth of sound become small and number of waves...
Aug30-09 04:40 PM
Senex01
1 632
This must have been posted on here before, but I can't find any reference to it. I've had to learn a little...
Aug30-09 02:46 PM
Senex01
57 2,903
Okay, I'm sure I must have overlooked something very trivial, so please help me with this: Two parallel infinite...
Aug30-09 02:04 PM
Preno
2 649
Ive been studying basic mechanics lately and have been trying to understand what "force" really is. First off, heres...
Aug30-09 01:40 PM
tiny-tim
10 1,501

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