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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 45,388
Hi, I have attempted a basic gravitation question from “Classical Mechanics” R. Douglas Gregory (1st ed). I get the...
Jul21-09 02:32 PM
Sourabh N
6 2,019
I would like to determine how long it would take a volume of water to cool from an initial temperature to a final...
Jul21-09 04:58 PM
mgb_phys
4 2,403
Im trying to find the velocity for the surface wave on water. Its like when you throw a pebble on a small lake and...
Jul21-09 05:35 PM
Hootenanny
1 1,212
How does one define an electric field??
Jul22-09 05:43 AM
nooma
8 1,000
Hi. Say a particle is moving around in uniform circular motion. The way my book attacks this problem is by placing...
Jul22-09 07:29 AM
jmb
9 2,118
Hello, I haven't learned a lot of physics and math, but I don't know how I misunderstand the following concepts: ...
Jul22-09 11:17 AM
andytrust
3 1,500
Hi All, I don't know whether this question makes any sense or not anyhow i will ask. For example, consider a...
Jul22-09 02:47 PM
Amar.alchemy
7 1,031
can you help me relate velocity and angle in a graph? please, how are they related? how is it possible to plot...
Jul23-09 01:54 AM
Cyrus
1 1,499
i think mirrors reflect light and light source 1 with x energy is reflected by the mirror which uses some of that...
Jul23-09 02:31 AM
maverick_starstrider
16 2,251
One expression for angular momentum is L=2m*(dA/dt),where m is the mass of the body in concern and (dA/dt) is the...
Jul23-09 06:10 AM
Urmi Roy
25 2,321
Someone on YoutTube stated... Each magnetic pole drops off by 1/R^2. Once you get away from both poles (Cavendish...
Jul23-09 10:28 AM
rockyshephear
18 3,498
Hello, My first post! Thank you for any replies! When looking at U values for windows (= 1/R) they are 99% of...
Jul23-09 05:19 PM
Kavy
2 932
I have read that "any" function of new and old coordinates may be used to generate a canonical transformation....
Jul23-09 06:07 PM
jojo12345
0 620
Hello, I'm confused about the whole electromagnet thing. So far I've got these concepts: - Passing a current through...
Jul23-09 09:07 PM
Bob S
3 742
Hi All Does anybody know if there is some formalism according to which we can describe the coulobian repulsion (or...
Jul24-09 12:27 AM
dE_logics
11 1,169
I have a problem in regard to the doppler effect,which may be generalised to all waves--sound,water etc. Please...
Jul24-09 03:36 AM
vin300
64 4,148
Would it be possible to determine the value of G by setting two very well know masses side by side on a very well...
Jul24-09 10:18 AM
sganesh88
6 792
To which entitity (operators, wavefunctions etc) in quantum mechanics do the dynamical variables and the hamiltonian...
Jul24-09 11:15 AM
guhan
3 854
I'm working on determining the differential equations governing two linked bars that rotate around a fixed pivot...
Jul24-09 01:17 PM
berkeman
1 2,174
Hello Say there's a uniform magnetic field changing in time (B=Asin(t) or something), and a ring (pic 1). so...
Jul24-09 01:43 PM
ibc
6 1,430
Alright I've been going crazy with this problem. I'm building an electrostatic loudspeaker. In order to get it right I...
Jul24-09 02:32 PM
nasu
3 1,020
Hi When reading about forces I see two things. 1. forces that act or do something. 2. force as something...
Jul24-09 05:06 PM
russ_watters
6 985
the solution for current I, for series LCR circuit is I = (E/Z)sin(wt+\phi) Where Z = \sqrt{R^2 + (X_{L}-X_{C})^{2}}...
Jul24-09 05:30 PM
Bob S
3 6,157
Do you know which is the energy per mol required to ionize air? Once the air is ionized, does it recombine it´s...
Jul25-09 01:26 AM
MATLABdude
3 7,437
In low freq magnetic communication, the carrier is not EM wave but low frequency varying magnetic field. Most of the...
Jul25-09 02:09 PM
fleem
9 5,726
Hi, The concept of "stationary / nonstationary EM fields" is not clear to me. Can someone please explain this to...
Jul25-09 09:23 PM
Madara
0 496
I received this problem recently from a friend, and I think I have the right answer but I'm not sure. I also might not...
Jul26-09 02:35 AM
diazona
5 894
This is a question from a mathematically-inclined homeowner who knows he /should/ be able to figure it out, but can't....
Jul26-09 02:43 AM
diazona
22 6,266
How does induction work? Give me examples aswell. Thanks
Jul26-09 04:21 AM
Awsom Guy
2 743
After playing with an electrical socket (with caution), I realized there is 120v between the black and ground wires....
Jul26-09 09:51 AM
turbo
2 2,910
Why do objects bounce? Let's say you throw a tennis ball at a wall. Why doesn't the ball just transfer its momentum to...
Jul26-09 01:19 PM
vin300
8 4,246
Sources say if lines are parallel they will repel else try and merge which I don't agree and even see practically. ...
Jul26-09 04:44 PM
larry moon
12 2,827
Since I'm around that old question about an observed phenomenon came to my mind: - a cup is filled with water and...
Jul26-09 06:15 PM
negitron
2 2,979
My roommate and I are working on a backyard physics/engineering project, with the intent to hopefully scale it up to...
Jul26-09 10:19 PM
Moebius_Prime
5 2,033
I want to know the difference between the 2 types of rotations shown in the picture attached . planetary orbiting...
Jul27-09 03:50 AM
sganesh88
5 1,029
Hi, Let us assume that I apply some amount of force at the end of the wrench to loosen a nut. This force makes...
Jul27-09 01:33 PM
Amar.alchemy
4 1,927
Hi, Can someone explain the concept of "Poincare sphere"? What's the relationship between the Poincare Sphere...
Jul28-09 01:53 AM
Madara
2 4,512
On page 10 of Goldstein's classical mechanics, it was said: "If V_{jj} were also a function of the difference of...
Jul28-09 05:50 AM
sadness
2 853
I have been asking this question of everyone I meet and can't find a straight answer. Imagine a wire rope anchored...
Jul28-09 06:20 AM
jmb
5 5,151
This is a picture of me in my bath. (dont worry, it is purely diagramatic!). I face a wall to the front of the bath....
Jul28-09 01:53 PM
negitron
1 391

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