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- 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 48,237
There is a rod treating as rigid body, the rod which mass is m and lenghth is R rotate about one end of itself with...
Aug27-09 03:56 PM
redoxes
11 1,028
I thought of what seems to be a very classical problem but I can't find a solution for it. At t=0 you have a sphere...
Aug27-09 03:54 PM
PhaseShifter
1 752
Hi and thanks in advance for any help with this problem. If I have a very very well insulated tank of water of say...
Aug27-09 09:15 AM
stoody
4 5,984
i was reading the book of Griffin - introduction to electrodynamics. it is written that the force of charge q on Q is...
Aug27-09 07:53 AM
jtbell
7 1,119
Like a radioactive particle emit rays, does this similar to the field lines of a charged particle? at what speed...
Aug27-09 07:22 AM
DaleSpam
8 775
While reading a very interesting article/lecture called Life at Low Reynolds Number, there was a reference to a...
Aug27-09 01:12 AM
Vanadium 50
2 1,159
Hi guys, I'm going through Reif's book on statistical mechanics and have a question on the parameter omega, the number...
Aug26-09 11:30 AM
Sam_Goldberg
2 5,439
Waht is the work done by friction when a man is walking? zero or nonzero? I was analysing the work done by...
Aug26-09 11:10 AM
vin300
21 2,965
I have heard many times that the positive "inductive" part of a circuit's reactive power is equal to "L i di/dt". I...
Aug26-09 02:14 AM
bjacoby
1 11,436
RE: Ocean Waves: 1. Linear Wave Formula - What is the average sea state that is capable of producing a 20 ft. wave?...
Aug25-09 12:45 PM
Governor
12 1,363
Say I want to put a bottle of water in the microwave and heat it up. How do I determine the pressure in the bottle as...
Aug25-09 09:48 AM
Lok
7 2,332
The total energy of a pendulum is calculated either by it's maximum height (Gravitational Potential), or by the lowest...
Aug24-09 02:52 PM
DaleSpam
21 4,511
I need a couple of formulas to determine the live and dead load on a stretched cable for a zip line. They are: 1....
Aug24-09 12:40 PM
Marcpost
0 4,332
Do only electrons emit a photon when accelerated in EM field? Do protons, for example, radiate?
Aug24-09 12:30 PM
Bob S
3 1,645
Hi, I'm looking for a little bit of help in this matter, I'm trying to put up a general formula of the internal...
Aug24-09 04:11 AM
TriKri
9 4,887
I'll explain the problem. \cdots \cdots \cdots \cdots \cdots \cdots \ldots=====|====== \cdots \cdots ||...
Aug24-09 02:05 AM
WiFO215
2 605
Hello-- Suppose that I insert a thin-needle thermometer into a porous material (such as snow) that consists of air,...
Aug23-09 11:05 PM
nkinar
6 1,129
I'm reading the book "Electricity and Magnetism: Vol. II" by Edward M. Purcell, in which he describes Gauss' law as...
Aug23-09 10:10 PM
Born2bwire
3 1,085
I've learned that the electrostatic force is about 10^{39} times greater than the gravitational force. I guess the...
Aug23-09 11:35 AM
Naty1
15 1,373
Hi, Is it possible to have a magnetic field B which has curl B = 0 in all space? intuitivly such a field will be...
Aug23-09 02:08 AM
naftali
4 5,256
I was unfortunate enough to have sports on the days of my mechanics classes so I've basically missed most if not all...
Aug22-09 11:52 PM
Mentallic
3 824
Hey guys, I have the following (non-homework) problem: I am simulating a collection of normally distributed...
Aug22-09 08:37 PM
creepypasta13
1 752
I am trying to work out the physics used in a micro-controller project. I am having problems with even simple...
Aug22-09 12:43 PM
sganesh88
2 863
Hi guys, I am reading Reif's book on statistical mechanics and have a question on the H theorem. In section 2.3, Reif...
Aug22-09 12:39 PM
Sam_Goldberg
10 1,903
Or how did Coulomb measure quantity of electricity while doing his experiments that leads him to claim his famous...
Aug22-09 11:39 AM
Bob S
4 1,470
Hi, I'm not sure this falls under the homework category, but I posted this here because I think this is more of an...
Aug22-09 11:14 AM
jfierro
5 2,711
if a system is made of 3 atoms with no degeneracy with energy levels of fro example 0, e, 2e would it be safe to...
Aug22-09 08:58 AM
Count Iblis
4 711
Is it true that partition function for canonical ensemble is Z=\sum_{\{states j\}}e^{-\beta E_j}=e^{-\beta F} ...
Aug22-09 08:49 AM
Count Iblis
9 1,339
My question is what causes death wobble? Let me explain more... The vehicle I've experienced this on is a Jeep with...
Aug22-09 04:03 AM
rcgldr
19 16,287
A classic problem in freshman electrodynamics is as follows: We have a capacitor (capacitance C1) charged up w/ charge...
Aug21-09 09:22 PM
Bob S
4 1,142
Hello Everyone, Recently, I was trying to explain the fundamentals of thermal radiation to a non-engineer and I...
Aug21-09 02:03 PM
CFDFEAGURU
2 890
Is there an other liquid that was similar water(In Convection current) but without the conductivity of it?
Aug21-09 12:14 PM
sampro
17 4,591
Here is an invention I'd like to share with anyone who has the money to develop and market it. Furthermore, I don't...
Aug21-09 09:18 AM
russ_watters
1 625
Let us consider a wheel which rotates about an axle thorugh its center with an angular velociy \omega0. After sometime...
Aug21-09 07:17 AM
Amar.alchemy
2 1,813
This is my first post so I hope I'm putting it in the right section :redface: I searched for similar questions but...
Aug21-09 02:34 AM
stevebd1
5 1,253
A steam engine stove produces, say, 10 units of warmth, the second law states that not all warmth can be converted...
Aug20-09 02:55 PM
Mapes
6 1,686
I was curious about how exactly energy was transferred in electrical circuits because all my texts were inadequate....
Aug20-09 10:23 AM
cak942
3 1,338
I need to find a means to calculate the load on three or four ropes that are supporting a weight between them. These...
Aug20-09 06:53 AM
DaleSpam
9 4,067
In what kind of instances would the quantity of impulse be used? My text book says that it's when very large forces...
Aug20-09 03:37 AM
mahela007
4 774
I was studying avometer, and came across this paragraph which I find confusing: "The voltage measuring part of the...
Aug20-09 02:51 AM
Darryl
1 1,298

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