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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 47,786
I attached a picture with 3 questions? My first question is, I know that for a convex or concave mirror, If I...
T 07:35 AM
jtbell
4 82
One particular experiment that I remember from a visit to a Science Center is the one involving a revolving platform...
T 06:22 AM
DaleSpam
21 276
Many of you are familiar with the catapult launched profile fuselage gliders that are sold in hobby stores. Since...
T 06:04 AM
A.T.
16 977
A free rigid body (no forces/torques acting on it) has a constant angular momentum. And yet, I am puzzled because...
T 04:43 AM
vanhees71
6 238
Hi PhysicsForums, I was wondering if this youtube was a correct representation of a photon traveling through space...
T 04:25 AM
vanhees71
5 171
Is there a mathematical relation for the temperature change when a fluid flows through a pipe from one end to another?...
Y 08:13 PM
Jay_
121 9,599
I came across this article was incredibly interested. I've read the paper and the material was completely over my...
Y 06:32 PM
nicetonietzche
0 87
In almost every textbook I have seen, pressure is said to be one of the most important state variables of a...
Y 06:11 PM
Chestermiller
9 143
Hi Guys! I have a, rather general, question regarding the nature of magnet repulsion. When two opposite poled...
Y 05:29 PM
Bobshark
2 76
Is a standing wave actually a traveling wave appearing to be still do to interference of two different waves? If...
Y 04:56 PM
Philip Wood
14 249
According to d'Alembert's Principle, the virtual work done by constraint forces must be zero. I have a few things...
Y 04:26 PM
Greg Bernhardt
1 189
Hello everyone, I was recently creating two different types of plasma for a Science Fair, one created from ionised...
Y 10:37 AM
Simon Bridge
7 211
Hi all, I'm new to the forums (in posting at least!). I recently graduated with a B.S. in Applied Physics, and have...
Y 08:49 AM
Andy Resnick
9 233
Hello PF'ers, Why is it that two light-bulbs produce twice as much brightness as a single light-bulb would? If we...
Y 08:24 AM
ViolentCorpse
4 165
I want to construct 5 sided dice in the shape of a square-based pyramid. When rolled, I want the die to have equal...
Aug25-14 09:09 PM
Haborix
12 333
hi, I'm a student and i have an electromagnet and a bar magnet paced head on coaxially and i want to calculate the...
Aug25-14 07:16 PM
Meir Achuz
32 783
I cannot seem to visualize how this compression and rarefaction occurs for example when I clap my hands, I know I move...
Aug25-14 07:09 PM
hongiddong
4 169
Hey! I need to calculate the electric field on the axis of a circular plate of radius a with the following charge...
Aug25-14 03:24 PM
loops496
2 118
Hello, I am having trouble understanding collision frequency in following discussion from Kubo,...
Aug25-14 08:46 AM
AirTycoon
2 97
Hello, I am a PhD student in chemistry, and need to determine the pressure of a reaction to be carried out I...
Aug24-14 11:32 PM
Chestermiller
5 172
I am having trouble wrapping my head around the idea of a piston/cylinder type arrangement where the piston has a...
Aug24-14 05:54 PM
ullrtech
7 245
I know that delta h(Enthalpy) is heat and it is also the total kinetic energy of the system. Temperature is the...
Aug24-14 02:13 PM
Andrew Mason
11 390
Wikipedia claims that the Chandler wobble (a deviation of the angular velocity vector of the Earth with respect to the...
Aug24-14 12:37 PM
stroustroup
0 127
While deriving lagrangian equation using D'Alembert's principle, in Goldstien, they defined a variable called "virtual...
Aug24-14 10:08 AM
USeptim
1 189
My question relates to entropy generation in a closed system ΔS=dQrev/T for a reversible process ΔS=dQ/T + Sgen for...
Aug24-14 09:54 AM
Chestermiller
12 237
Just read in Taylor that in general the kinetic energy can depend on position as well as velocity. I believe him, but...
Aug24-14 09:47 AM
USeptim
9 297
How magnetic field associate with mass........ from the experiment we know that this is due to electric charge........
Aug24-14 06:39 AM
ChrisVer
3 231
For the classic Lenz law demonstration using a neo. magnet dropped down a copper pipe, is the magnetic force generated...
Aug24-14 02:52 AM
Philip Wood
9 780
We know that a steam power plant is basically a heat engine with steam as the working fluid. According to the...
Aug23-14 11:35 PM
Soumalya
8 991
when a magnetic field exert force on a moving charge the work done by it is 0.But bar magnet do work.And i read that...
Aug23-14 04:52 PM
DaleSpam
83 2,069
I am not sure if this is the right forum for this question, but I arrived at the question while studying the principle...
Aug23-14 03:18 AM
A.T.
9 267
In my theoretical mechanics class, we went over some very basic conservation laws (namely momentum) and talked about...
Aug22-14 03:37 PM
Orodruin
1 167
Hi all, I am preparing for my "second chance exam" in analytical mechanics. It is a graduate course i.e. based on...
Aug22-14 11:38 AM
samalkhaiat
2 220
Divergence of electric field is 0 for the field produced by a point charge at origin at points other than origin is 0;...
Aug22-14 12:43 AM
DeltaČ
1 207
In vector form, L=Iω. I am trying to show that for a point particle, this reduces to L=rxp, but am getting an...
Aug21-14 06:05 PM
jtbell
1 152
I was going through "Engineering Thermodynamics" by Cengel & Boles studying exergy analysis of a closed(non flow)...
Aug21-14 01:36 PM
Soumalya
3 190
For a uniform, hollow cylinder, why is this derivation wrong? M = mass of whole solid cylinder m = mass of missing...
Aug21-14 12:42 PM
BrainSalad
3 185
I'm given an expression for the pressure of air with height z, as P(z)=P(0)e^{(-mgz/k_bT)} Where m is the...
Aug21-14 11:09 AM
Greg Bernhardt
1 228
Hello Forum, Resolution is an angular distance (measured in fractions of an 1 degree angle). The lower the...
Aug21-14 09:52 AM
fog37
3 198
Ok small bit of a problem which I have been experiencing. I am using an industrial size plasma oven by advance...
Aug21-14 02:16 AM
martine5
0 184

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