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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 47,822
Is it possible to show that the maximum efficiency for a heat engine is given by \eta = 1 - \frac{T_c}{T_h} where...
Mar24-11 05:47 AM
netheril96
4 13,593
http://img835.imageshack.us/i/anmol.png/ the graph is as per the link but my question is that at a particular...
Mar24-11 02:22 AM
Sourabh N
1 1,911
What is the longest focal length practical for a lens and/or shaped mirror? I ask because it would be good if we...
Mar23-11 11:06 PM
Drakkith
1 603
Pardon me if this is the wrong section for this question, but "energy" seemed like a topic that could fit in almost...
Mar23-11 09:01 PM
netheril96
9 4,019
hi, How can I show that the chemical potential of an ideal gas (T,V ) can be given by: \mu(T , V , N...
Mar23-11 08:27 PM
Curl
4 3,528
I am designing an eddy current brake system for use in roller coaster design. I have the flux density required to...
Mar23-11 04:21 PM
os220
2 1,905
Dear Friends & Colleagues, I would like to propose the following Question, Is there a way to technically Measure...
Mar23-11 11:39 AM
cleanenergy
2 2,472
Dear Colleagues, I would like to submit to your court the article in which we attempt a physical analysis of living...
Mar23-11 09:23 AM
Vladimir Matveev
2 956
I have two physics books that state that U(r) = -GMm/r What I don't understand,is how can potential energy be...
Mar22-11 10:39 PM
rcgldr
7 1,701
I have to create an object that will accelerate down a ramp and travel for three meters. Once i solve the angle of the...
Mar22-11 10:16 PM
ronshore
0 860
Hi, I'd like to know what makes a magnifying glass better at starting a fires by focusing the sun light. Is it the...
Mar22-11 08:45 PM
Atrika
10 6,068
Hello all, Just wondering if someone can give me a brief explanation of Wood's anomaly with regards to optics. ...
Mar22-11 07:16 PM
astrosona
2 13,564
Lets say we have a fixed voltage output on a generator... As we load it down (require more current to flow out of...
Mar22-11 06:18 PM
Curl
5 1,085
In my book, it says that gravity can be thought of as a force in the form of this vector: F= (-GMm)/(x2+y2+z2)*u ...
Mar22-11 05:44 PM
HallsofIvy
2 2,453
a) If heat flows through a stack of several different layers, what quantity is the same for each layer? What...
Mar22-11 02:24 PM
tytydinky
0 1,348
what is the difference between eddy current and induced current? and how could eddy current cause energy loss? does...
Mar22-11 12:41 PM
brainyman89
32 4,637
We did an experiment using the physical pendulum to measure gravitational acceleration g. A graph is shown in this...
Mar22-11 10:27 AM
netheril96
2 1,497
Well the question is in the title. Does Malus' Law (http://en.wikipedia.org/wiki/Malus%27s_law ) follow automatically...
Mar22-11 09:41 AM
A. Neumaier
3 7,643
Often times I read in these forums that the sped of light is C in a vacuum, but is slower in non-vacuum environments....
Mar22-11 09:37 AM
A. Neumaier
5 2,016
What is the cause of Gravitation?
Mar22-11 07:33 AM
jtbell
3 541
I'm seeking some clarification on a topic found in Jackson 'Classical Electrodynamics' Chapter 5. This deals with the...
Mar22-11 05:38 AM
netheril96
8 17,143
just got a bit confused : because acceleration is a vector , so can we define acceleration for speed , that is , if we...
Mar21-11 10:05 PM
phymatter
2 742
So I'm creating a game. I have a physics engine in the game. There's a use case that I've come up with that I don't...
Mar21-11 07:14 PM
DrSammyD
3 792
What experiments have been done to prove that the speed of light is constant among all frames of reference?...
Mar21-11 06:28 PM
nhmllr
2 1,162
Hi, I was wondering about an issue that we just started in my physics class: we learned that center of mass (CM)...
Mar21-11 05:41 PM
K^2
6 2,861
Hey rocket folks - In light of those artists that deal with massive art, like covering an outdooors area with...
Mar21-11 12:38 PM
DaveC426913
12 2,226
I am having a hard time figuring out the signs for some of these formulas: First of all, U=Potential Energy...
Mar21-11 06:35 AM
tiny-tim
5 4,621
We were working on some Lagrangian and trying to solve it using an ansatz. Due to some problems in the results we got,...
Mar21-11 04:45 AM
Bill_K
1 1,015
I have a question concerning the electric field of a rotating linear dielectric disk (with angular velocity w) and a...
Mar20-11 11:55 PM
phys_1
0 1,331
Hi, I want to solve the forced wave equation u_{tt}-c^2u_{xx} = f''(x)g(t) (primes denote derivatives wrt...
Mar20-11 11:23 PM
nickthequick
3 1,669
Hi, I'm struggling to understand the different friction forces acting on a car. What is rolling friction and what...
Mar20-11 09:09 PM
jack action
2 1,124
need a hydraulic pump (gpm) ? to drive a hydraulic motor (torque)? - that has to replace a 16 horsepower gas...
Mar20-11 08:58 PM
jack action
1 1,493
G'day, Just wondering if someone can explain to me how when an object is moved to a higher point above the earth,...
Mar20-11 12:35 PM
rcgldr
10 2,899
Ok, I'm studying electric fields this semester, covering Gaussian Law, capacitance, dielectric circuits and dc...
Mar20-11 10:55 AM
Ambidext
0 685
Here we have got a very long rod (100 million km length or so) built/placed on the lunar surface (near equator) and...
Mar20-11 08:24 AM
Vanadium 50
12 1,352
how to prove that (a)(dU/dV)T=0 (b)(dH/dP)T=0 for an ideal gas.
Mar20-11 08:18 AM
Vanadium 50
1 672
I wanto show that: \partial_{\mu} T^{\mu \nu}=0 for T^{\mu\nu} = F^{\mu \rho}\eta_{\rho\sigma}F^{\sigma...
Mar20-11 03:44 AM
MathematicalPhysicist
7 1,371
Can an object be increasing in speed as its acceleration decreases? if so, give an example; if not explain why.
Mar20-11 03:07 AM
abrowaqas
3 790
Can anyone tell me what G force would be received when going from 30mph to 0mph in 0feet. This is from involvment in a...
Mar19-11 07:43 PM
Lsos
3 897
Hi, in class we were talking about lenses and how there is a certain focal length where all images 'far enough' away...
Mar19-11 03:53 PM
Andy Resnick
1 1,001

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