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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 47,662
Hi, Problem Statement: A flywheel with Moment of Inertia I, and rpm w1 is rotating. It has a shaft at is center...
Jul29-09 06:36 AM
tiny-tim
1 2,107
I would like to put this out for argument that there is no such thing as magnetic flux density. Since magnetism is a...
Jul29-09 04:14 AM
A.T.
13 1,135
Greetings, The other day while working on my car I began thinking about solenoids and how they work, but I think I...
Jul29-09 01:49 AM
jfowle
0 757
So given the common explanation here for Del dot B equals 0 to be "There are no magnetic monopoles.", since the title...
Jul29-09 01:25 AM
rockyshephear
24 4,167
You know how metal shavings form bows of flux lines. How is this possible since there are no discrete flux lines. I...
Jul29-09 01:13 AM
rockyshephear
2 742
I've been told over and over its the amount of something entering a given surface. But the amount of what? Twinkies,...
Jul29-09 12:50 AM
rockyshephear
4 719
Hi all, can a laser light be magnified by means of a magnifying glass?
Jul28-09 06:58 PM
russ_watters
14 1,481
I'm currently writing my own physics simulation engine for some practice with physics since I plan on taking it as my...
Jul28-09 06:05 PM
dgreenheck
17 4,335
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
1 396
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 5,243
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
2 871
Hi, Can someone explain the concept of "Poincare sphere"? What's the relationship between the Poincare Sphere...
Jul28-09 01:53 AM
Madara
2 4,574
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 1,957
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 1,114
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 2,051
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 3,007
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 2,847
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 4,291
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 2,993
How does induction work? Give me examples aswell. Thanks
Jul26-09 04:21 AM
Awsom Guy
2 760
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 6,417
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
5 910
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
0 500
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 5,764
Do you know which is the energy per mol required to ionize air? Once the air is ionized, does it recombine its...
Jul25-09 01:26 AM
MATLABdude
3 7,505
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 6,214
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
6 995
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 1,036
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 1,457
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 2,194
To which entitity (operators, wavefunctions etc) in quantum mechanics do the dynamical variables and the hamiltonian...
Jul24-09 11:15 AM
guhan
3 862
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
6 806
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 4,256
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 1,176
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
3 751
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
0 627
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
2 941
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 3,597
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 2,361
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 2,282

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