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- 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 41,758
What I mean by the title is, why isn't it more popular? (I know there DO exist some hydrogen powered cars.) To me...
Dec1-13 03:30 AM
CWatters
26 6,039
Hello, Here's my challenge: I want a physics model for how one would go about in order to decay the moon's orbit....
Dec2-13 09:45 AM
BruceW
10 1,066
I've noticed that electromagnetic field lines are very similar to stereographic projection of 3D sphere on 2D surface....
Nov26-13 05:15 PM
Jano L.
2 880
Hi, please could someone help explain how magnetic flux works in Faraday's law as I struggle with electromagnetism. ...
Dec1-13 02:07 PM
tiny-tim
6 461
Hello, I have an issue with the problem below. I have a series connection of two variable capacitances C_{1}(t)...
Nov2-13 12:30 PM
Barloud
2 383
I'm working on my engineering capstone design and part of our design requires a code we have written to calculate the...
Nov5-13 10:22 AM
voko
3 530
Hi All, I would like to know why the neon lamp is used to measure electrical polarity. What is the working...
Dec7-13 08:29 AM
TumblingDice
4 552
Who can provide a physical understanding to this solution to the 3D periodic Navier-Stokes equation:...
Dec2-13 06:07 PM
SteamKing
2 518
Consider a capacitor with 4 parallel plates and 3 dielectric insulators arranged like this...+I-I+I- The insulator...
Dec2-13 04:38 AM
sophiecentaur
17 1,039
In chapter 5, magnetostatics, of Griffiths' Introduction to Electrodynamics (third edition), there's a problem in the...
Nov27-13 12:26 PM
Philip Wood
3 711
Hi guys, I've got a doubt concerning to the minimum mechanical work and the work-energy theorem. Consider the...
Nov27-13 03:06 PM
dapias09
2 506
I know how this formula is made, but surely Δs becomes highly inaccurate for large values of Δθ and r? In fact when...
Nov26-13 06:55 PM
DaleSpam
13 535
Hi, I recently became acquainted with foam sleeving as a material for forming a resonant cavity via this link:...
Nov27-13 03:16 PM
AlephZero
2 390
What can a gaussmeter tell me about a metal? I am just experimenting with various metal disc samples by setting them...
Nov26-13 11:42 PM
tempneff
0 355
In the figure attached, we have one section which has three bars all pin-connected together and pin fixed on the...
Nov27-13 06:03 PM
sophiecentaur
4 429
For example, let's say there was an block infinitely long in the x and y direction and in the z direction bounded by...
Nov29-13 05:54 PM
Simon Bridge
3 377
From my understanding, surface plasmons (SPs) are oscillations of electrons caused by incident EM waves. A photon...
Nov29-13 01:07 AM
DrDu
3 388
This question is just about a thought I was having. If a 1 kg object which is at rest is made to accelerate with a...
Nov28-13 05:01 PM
FieldvForce
20 450
in class, we just learned that the chemical potential was μ=∂G/∂N i'm looking in my book and it says that...
Nov28-13 04:12 AM
DrDu
3 330
osmotic pressure is the pressure difference between two solutions of different solute concentrations separated by a...
Nov28-13 12:54 PM
sophiecentaur
4 385
I am having a hard time proving this to myself: Given some object with a known inertial moment and center of mass,...
Nov28-13 10:07 PM
PBear
9 622
Should it be added to the Cauchy stress to calculate a "total stress", or it doesn't have such a physical...
Dec2-13 09:18 AM
Andy Resnick
2 566
Hello Everybody, Span efficiency factor appears in the lifting-line theory of Prandtl describing Lift and vortex...
Dec1-13 01:03 AM
rcgldr
11 997
Recently I have been troubled by several things which have been stated in my school physics classes, mainly concerning...
Nov29-13 04:57 PM
BruceW
30 1,509
Refer to the second diagram on this website http://electron6.phys.utk.edu/optics421/modules/m5/Interferometers.htm ...
Nov28-13 08:42 PM
Simon Bridge
1 309
Hi everyone I had this very silly question pop up that unfortunately I cannot find an answer to myself. If an...
Nov29-13 01:28 PM
rcgldr
17 555
I am a little confused with this subject. If you have a mass hanging from a spring, there is a specific equilibrium...
Nov28-13 06:54 PM
TumblingDice
4 446
In other words, why are ice cubes trays shaped like the left-hand figure instead of the right-hand one? ...
Dec1-13 03:33 AM
CWatters
9 540
is the boltzmann factor the probability of a particular state of a system? can someone explain the partition...
Nov30-13 01:28 PM
stevendaryl
10 542
Hi, i´m reading Landau´s mechanics and in the 4th chapter in the part disintegration of particles (16) i can´t...
Nov30-13 05:44 PM
Simon Bridge
3 445
Hello. In my textbook by Jose Saletan called Classical Dynamics: A Contemporary Approach the author talks about TQ,...
Nov29-13 06:18 PM
mjordan2nd
8 359
Hi guys, I'm studying the Kinetic Theory of gases from Pauli's book Vol. 3. Here he describes a section on the Mean...
Dec1-13 08:52 PM
Simon Bridge
7 523
hi :) ...
Dec1-13 04:52 PM
Nikitin
4 445
Hi Folks: I'm pondering teaching torque and having students build mobiles as part of that. I started wondering if I...
Dec1-13 03:41 PM
Simon Bridge
6 576
Hello, I am not completely certain why in thermodynamics, it seems that everything is done as a partial derivative,...
Dec2-13 08:35 AM
WannabeNewton
2 386
There is a battery connected to a non ideal circular conductor wire. What is the specific mechanism by which one...
Dec7-13 03:41 PM
jartsa
18 750
$${\rho}({\lambda}) d{\lambda}=E({\lambda})*f({E(\lambda}))*D({\lambda})d{\lambda}$$ $${\rho}({\lambda}) d{\lambda}$$...
Dec7-13 05:47 PM
Outrageous
2 372
I'm doing battle with someone in a debate and I need some help here as, perhaps, I'm not articulating my side well or...
Dec7-13 12:08 PM
sophiecentaur
7 512
My question is the following: In field theory, if I have a constraint \chi(q_a, p_a, \partial_i q_a) that depends...
Dec7-13 06:19 AM
Bobhawke
0 304
I have a tortoise shell sitting in two parts on my desk (the top and the bottom). I somehow got it in my head that it...
Dec7-13 09:35 AM
Nick O
0 428

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