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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 45,902
I have an image taken with a camera. I know the f/#, focal length, CCD characteristics, and an approximate distance to...
Aug30-12 08:54 AM
Andy Resnick
10 1,319
Here is a simple example about my issue with this. 1g ball (ball A) moving west at 10m/s hits another 1g ball (ball...
Aug30-12 07:49 AM
mickybob
6 3,252
Here is a quote from one of the MIT notes on magnetism : "Note that F(magnetic force) is perpendicular to v and B ,...
Aug29-12 05:57 PM
gabbagabbahey
9 1,073
I have a question. All things being equal as far as flow and pressure goes...where would the gas preferentially flow...
Aug29-12 04:08 PM
Integral
14 913
Hey I just wanted to check with y'all, but I feel I'm fairly well acquainted with momentum and the rules surrounding...
Aug29-12 02:53 PM
A.T.
1 1,013
Hi everyone I have a quick question regarding heat transfer. I have yet to study heat transfer yet but I have a basic...
Aug29-12 01:56 PM
pa5tabear
1 594
I need to calculate the torque needed to move an object in horizontal direction. The object is subjected to a force P...
Aug29-12 07:34 AM
mfb
1 862
I am not sure if this is wright section for this question,so please excuse me if a made a mistake. I am thinking of...
Aug29-12 02:27 AM
Bobbywhy
4 654
The cartesian sign convention for a convex lens is follows: 1. All distances on the principal axis are measured from...
Aug29-12 02:24 AM
Simon Bridge
3 541
Hey, I am helping out with a class and the students were given a question about an electroscope that is being...
Aug29-12 02:22 AM
Simon Bridge
3 993
Hi I had a few thermodynamics questions on a thread that was locked. The link is here and my questions are directed...
Aug29-12 02:13 AM
Darwin123
20 2,378
I am trying to better understand some concepts in magnetism and I hope that someone here can help clarify a few...
Aug29-12 01:17 AM
SamBam77
3 865
Suppose a permanent bar-magnet is placed inside a toroid/torus and the toroid is then completed and power applied. How...
Aug28-12 11:09 PM
Simon Bridge
3 1,379
Hello Forum, In kinematics we study motion and the trajectories of moving bodies. The trajectory is a line...
Aug28-12 01:56 PM
voko
4 1,042
How exactly does water behave in a magnetic field? I've seen pictures of a boat that uses electromagnetic rail...
Aug28-12 01:11 PM
soothsayer
5 847
I'm interested in working out an efficient and precise numerical method to find the charge density on a conductor with...
Aug28-12 11:33 AM
bcrowell
5 993
Say an object is dropped out of a plane at height h above the ground and flying at a constant speed v0... Ignoring...
Aug28-12 09:10 AM
mfb
2 680
Hi all! I'm trying to study the Poincare group and I have one problem. I'm reading a book: Gross D. Lectures on...
Aug28-12 12:43 AM
vanhees71
2 904
Hi My textbook mentions "We know that in an electrostatic situation (with all charges at rest) the electric...
Aug27-12 09:25 PM
gabbagabbahey
1 861
what creates magnetic fields, magnetic poles or currents? are those theories equivalent mathematically? i read in...
Aug27-12 08:28 PM
BruceW
1 516
Thermoelectrics convert heat to electric power (albeit a meager amount), It reduces the entropy of a system. Does...
Aug27-12 06:51 PM
Darwin123
14 1,208
Hello everybody, I would like your comments on my findings and perhaps prompt me to look at relevant literature. ...
Aug27-12 05:16 PM
soothsayer
6 662
In a collision the colliding particles will in general have different velocities at different instants of time....
Aug27-12 04:48 PM
voko
9 944
Suppose you push a stick by a distance of s like on the picture. It will start to rotate as you along. My question is:...
Aug27-12 02:37 PM
aaaa202
2 614
Hi, I'm Chaitanya, 4th year undergraduate student in biomedical engg. I have an idea of making a mobile phone...
Aug27-12 01:04 PM
Kaycee92
2 631
I have been out of school a long time, so please go easy on me. If the answer is an equation with symbols or letters,...
Aug27-12 09:28 AM
cowpup
2 975
I'm looking at the free energy of a body (theory of elasticity) but I can't really square the general expression with...
Aug27-12 08:28 AM
malasti
4 773
This doubt is nagging in my mind for couple of days,and its makes the rest of the things so dizzy and confusing.Heres...
Aug27-12 07:22 AM
Redbelly98
11 1,422
Hypothetically, if I had a sphere and a block (of the same mass and material (hence the same coefficients of static...
Aug27-12 07:20 AM
Maertens
11 3,014
Someone asked me how Faraday's Law of Induction and Ampere's Force Law, both which form part of Maxwell's Equations,...
Aug27-12 06:52 AM
Lamarr
4 3,228
Can anyone tell me the physical interpretation of the flux of an electric field through a closed surface. I think I do...
Aug27-12 03:15 AM
luitzen
6 1,590
I have a thought experiment for physicists and thermodynamicists and the like. Those who are always looking for 2+2=4...
Aug27-12 12:09 AM
K^2
13 1,551
Hi all, I'm doing what should be a pretty simple problem, but some theory is giving me trouble. Basically, in...
Aug26-12 10:20 PM
gabbagabbahey
1 946
Quote: "All moving charged particles produce magnetic fields." Hypothetically - if you took a bunch of charged...
Aug26-12 01:10 PM
StephenofCaly
4 1,640
Hi In my book (Griffith's) there are two different expressions for the induced polarization, namely P =...
Aug26-12 09:24 AM
Niles
0 595
I have been wondering about the physical reason why a TE wave that goes STRAIGHT through the waveguide(without any...
Aug25-12 06:33 PM
marcusl
4 860
http://www.physicsforums.com/showthread.php?t=27021 I saw this problem and I think that is interesting but that...
Aug25-12 12:34 PM
matematikuvol
0 477
We have a metal sphere of radius R in the space and resistivity p. At a distance d>R from it we have antoher sphere of...
Aug25-12 06:49 AM
Salah93
0 512
I want to get some terminology straight. A non-autonomous system is as far as I can understand a system, where the...
Aug25-12 06:06 AM
voko
1 938
Calculating the internal energy of gasoline is fairly simple, because it wouldn't vary much with temperature or...
Aug24-12 07:30 PM
Drakkith
1 718

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