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Classical Physics

- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
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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 41,718
Why is it that the equation for work done to stretch a spring is W = 1/2k(x22-x12) while the work done by a...
Sep20-09 08:26 PM
woodie37
11 12,803
hey guys just a quick question Does anyone know the u value of jusy normal glass? Ive looked everywhere and ive got...
May9-09 08:30 AM
russ_watters
3 12,766
Hi, 1) Can anyone explain to me from a conceptual standpoint, why increased current leads to an increased voltage...
Sep9-10 07:49 AM
ZapperZ
23 12,713
I've got an investigation in which iam investigating the factors affecting the perioad of a BIfilar pendulum. So has...
May6-05 12:57 AM
Graham
12 12,711
is an emf produced by a changing magnetic field or by a moving magnetic field?
Nov20-08 01:23 AM
Robin07
31 12,705
Conservation of linear momentum is consequence of which one of Newton's three laws?
Feb23-09 11:10 PM
vjraghavan
9 12,619
hey guys, i've been experimenting with a pendulum and while doing the error discussion for my experiments i got stuck...
Apr28-09 08:46 PM
Volcano
8 12,576
Can someone give me the equation to calculate the change of Cv (specific heat at constant volume with change in...
Apr6-07 05:51 PM
Gordon Arnaut
6 12,569
This my first post on this very helpful forum. So are angular displacement, velocity, and acceleration actually...
Dec12-08 11:34 PM
pianoforte
5 12,519
Why is the derivative of energy force? For example: KE=1/2mv^2 the derivative of which, assuming mass is held constant...
Dec26-10 03:51 PM
AlephZero
7 12,484
an experiment^^ in a closed container, means tat it has a constant volume. when i increase the air pressure...
Feb13-08 03:01 PM
DaveC426913
20 12,475
So what is it? This is not a homework question. But I anticipate a good discussion.
Jan23-04 05:50 PM
ketch
23 12,468
The air temperature at an altitude of 10,000 meters is a chilling -35 C. Cabin temperatures in airplanes flying at...
Feb22-04 05:22 PM
russ_watters
5 12,466
I'm studying for the Physics GRE and going over my thermo notes. Ok, so for enthalpy change (delta)H = (delta) U...
Oct14-09 08:21 AM
Mapes
5 12,433
Is There Any Reason Why Tesla's Wardenclyffe Tower Wouldn't Work? All the sources I've seen on his work and...
Feb19-07 07:32 PM
cesiumfrog
5 12,410
As far as I know, you can't prove laws, but anyway... We got to do an experiment at school. A weight is suspended...
Jan16-12 05:29 AM
harrylin
35 12,399
How would you explain this homopolar motor seen on youtube? <object width="425" height="344"><param name="movie"...
May21-10 11:37 PM
Relay
7 12,387
We could use the change of entropy before and after eh phase changed to calculate the latent heat L = (S_{after}...
Jan4-09 03:22 AM
olgranpappy
1 12,348
Hello frnds, i understand what conservative and non conservative force are but i didn't get it properly with practical...
May3-12 06:39 AM
Ravi Mandavi
4 12,341
When current is allowed to flow through an electric conductor, magnetic fields are produced. What actually causes the...
Nov17-10 09:20 PM
Mohammed0
41 12,302
Since running a current through a wire will increase the temperature of the wire, is there an equation for calculating...
Dec23-09 12:34 PM
Jake110
14 12,275
Hi all Another thought I have been pondering is why don't I weigh significantly more at the poles than I do at the...
Jul24-07 03:29 PM
laurelelizabeth
66 12,265
I am following the book 'Introduction to Electrodynamics' by Griffith. In that book,the magnetic field outside an...
Apr25-07 11:42 PM
Coto
17 12,242
I'm working on a vibration frequency problem involving a thin, circular aluminum membrane with a radius of 0.01m. ...
Nov15-04 10:43 PM
rayjohn01
3 12,241
Does the metal pole of most umbrellas increase significantly the risk of the bearer being struck by lightning? In...
Oct28-10 01:51 PM
Bob S
9 12,210
I've been working on a simulation of a Lorenz Waterwheel, and friction was killing it - I couldn't use realistic...
Oct31-11 03:47 PM
berkeman
14 12,173
Hello All.... I am just wondering about something. The lift equation is, L= \frac {C_L \rho A V^2} 2 ...
Oct24-07 04:31 AM
white flock
4 12,172
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 12,158
I know the basic answer, that the movement of air sets things vibrating which makes noise, but I don't know the...
Apr27-06 03:34 PM
miket
3 12,138
Hi, this is my first post. I've not taken a calculus-based physics course yet so these may be rather naive questions....
Nov12-07 11:31 AM
DaleSpam
3 12,131
What is the difference between "uniform plane waves" and "planes waves." Are these terms used interchangeably? What...
May1-07 08:21 PM
Claude Bile
16 12,119
Why is the triple point of water .01C while the freezing point 0C? It seems contradictory.
Oct24-07 12:26 AM
animalcroc
7 12,102
Hello! First post here :-) Hope this isn't too simple for this forum...if so, by all means give me a pointer... ...
Oct4-10 01:42 PM
Zeppos10
26 12,101
Hi everyone, I am no expert in any means, so if what I am asking is silly, just tell me. This is an example. ...
Dec19-12 11:57 PM
Chestermiller
16 12,099
What's the definition of "vector components"? I mean that when I resolve a vector into two components, my teacher...
Jul24-07 06:32 PM
Doc Al
2 12,096
why coefficient of friction is less than 1? dose it have a phisical answer
May14-07 03:54 PM
DyslexicHobo
9 12,093
I have been doing mechanics in college and in the present chapter,two of the concepts that I found rather confusing...
Mar25-11 02:51 PM
tiny-tim
18 12,070
i have set up an equation to get the heat transfer rate Q for a combined system where heat is transfered from a...
Oct17-08 10:43 PM
riscy
3 12,065
consider a symmetrical solid body. we say its centre of mass is at its geometric centre. that is, for uniform density...
Jan6-08 12:29 PM
arildno
1 11,993
why gravitational potential energy is negative?
Apr12-07 03:56 PM
Robert J. Grave
10 11,966

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