
Before posting anything, please review the Physics Forums Global Guidelines.
Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
46,943 
if you have a permanent magnet slotted into a laminated yoke like a transformer has. But this yoke has a telescopic...

Feb908 07:37 PM
philrainey

4 
1,806 
Thought you guys might find this article interesting and that maybe it would spark some conversation.
What are...

Feb908 06:18 PM
russ_watters

1 
5,503 
Is there any valid formula which can apply to both thermodynamics and fluid mechanics, as they are both based on the...

Feb908 04:41 PM
John Creighto

4 
7,935 
I have some extended aluminum part which is at low temperatures. It is connected by a thin alu rod to a cooling device...

Feb908 12:09 PM
GT1

28 
11,005 
hi everybody,
how does isolation work ?
some things dont conduct heat , whereas other dont conduct cold.
what...

Feb908 06:37 AM
Hootenanny

16 
4,145 
Hello. I am a new poster; I hope I am correctly observing the forum rules.
I have a slightly philosophical question...

Feb808 04:59 PM
pterid

2 
1,748 
I have faced a weird question: Examine if the cylindrical polar coordinates represent a set of genralized...

Feb808 04:29 PM
dipstik

9 
2,118 
I know it's old already.. but this came up when I was lecturing my mom on the evil effects of urban myths and stuff.....

Feb808 03:04 PM
mgb_phys

11 
9,386 
Can anyone give me an object where the center of mass and the center of gravity are in different locations?

Feb808 09:26 AM
Doc Al

3 
1,902 
Hi all
I am wondering about recent developments of classical dynamics. It seems most physicists are now devoted to...

Feb708 10:59 AM
Roche

15 
2,200 
How to visualize thhe components of the energy tensor????
I mean to say that what it means to say that "the amount of...

Feb608 03:15 PM
robphy

2 
2,728 
what is classical physics?and what are the theories of modern physics which have proven it wrong?

Feb608 08:01 AM
Andy Resnick

8 
1,344 
I am looking for a link to some graphs that illustrate horizontal and vertical flight of a projectile. Anyone have a...

Feb508 09:03 AM
john b

1 
1,797 
I'm reading an old, maybe outdated, paper by Karl Popper about the 2. law of thermodynamics, brownian motion and...

Feb408 08:15 AM
Andy Resnick

1 
3,064 
Is the oldest known physics the relation between string tension and pitch, first discovered by the Pythagorean school?

Feb408 08:08 AM
Andy Resnick

4 
2,376 
Could someone perhaps explain how a potentiometer can be used to measure an unknown emf? My book gives a bad...

Feb308 05:37 PM
Joza

3 
3,081 
Suppose the magnetization of some substance depends on the field H and temperature, i.e. M(H,T) and we have the...

Feb308 11:24 AM
da_willem

0 
1,257 
What is the potential energy of a uniformly charged spherical shell; i think it is called the self energy of shell.

Feb308 11:19 AM
Shooting Star

13 
10,597 
Hello, everyone. I've been working with this physics problem for about a week without much success, and this looked...

Feb308 10:22 AM
DaleSpam

4 
1,563 
Hello i need this för a coding project im currently occupying myself with =)
ok so the system is in a 2D space, the...

Feb308 10:03 AM
DaleSpam

4 
4,374 
Hello!
I have a question arising from my course in statistical physics: Describing microcanonical, canonical and...

Feb208 04:17 PM
Mapes

3 
1,568 
So I'm reading "Mathematical Physics" by Donald H.
Menzel, and I don't buy the following derivation from
...

Feb208 01:46 PM
John Creighto

2 
1,905 
Got this question somewhere: A boy is standing on a rotating platform. The system has a kinetic energy 'K'. Now, the...

Feb208 12:34 PM
lightarrow

5 
1,380 
Consider int(E.dA)=q/e, guass law relating the electric field to the charge enclosed.
One can also derive (using...

Feb108 10:23 PM
user01

6 
4,338 
In classical Hamiltonian mechanics, the concept of a canonical transformation ("CT")
preserving the form of...

Feb108 06:29 PM
strangerep

0 
1,309 
Hello All,
I am new to this forum, and right up front I will say I know very little about physics in general. That...

Feb108 11:28 AM
Andy Resnick

1 
1,477 
in my fields course we are using the metric tensor g=diagonal(1,1,1,1), off diagonal(0)
i'm looking for an...

Jan3108 09:44 AM
jcsd

4 
1,625 
what is the difference between classical mechanics and quantum mechanics??
other than that classical mechanics...

Jan3008 03:35 PM
samalkhaiat

14 
2,518 
I'd like to see an example of a formula describing the position of a rolling ball over time. It has been given one...

Jan3008 03:15 PM
PatPwnt

3 
2,385 
Is there any material such that if you make a hollow object out of it, the magnetic field inside is not equal to the...

Jan3008 12:02 PM
Ulysees

9 
12,086 
Is there any situation where the electric field drop exponentially in free space? thanks

Jan3008 10:54 AM
jdavel

5 
1,952 
Hi,
(All oscillations I'll be talking about here are longitudinal.)
For coupled oscillations of 2 masses between...

Jan3008 07:05 AM
pam

1 
1,955 
If not, then what are the conditions for us to construct a periodic boundary condition(PBC)?
If so, then please help...

Jan2908 10:07 AM
qijiongli

4 
4,896 
Hello All,
I just read in a book that springs are pretty much analogous to capacitors in terms of energy...

Jan2908 07:47 AM
TVP45

1 
3,408 
Hi all.
Picture a series of strings around a circle, oscillating with fixed ends. Now picture a these strings as...

Jan2808 10:40 PM
SteveDB

0 
1,169 
I'm looking to simulate a bouncing and spinning ball in two dimensions. I have the detection working fine but I'm...

Jan2808 10:23 PM
gcoope

0 
1,633 
I am constructing a 'white line detector' to use on the underside of a robot. The crucial components are an...

Jan2808 11:45 AM
joeisthedude

0 
3,296 
I'm attempting to write a simple model to describe the angular velocity profile (aka angular acceleration) of a...

Jan2808 09:20 AM
vortmax

3 
2,540 
Hello,
I am a computer science researcher and I have had my last physics and math courses several years ago so I...

Jan2808 03:31 AM
wmac

0 
1,648 
If I have a vector for the angular momentum of a ball rolling along a plane in terms of the world and I wan't to...

Jan2808 02:41 AM
Bobolis

0 
7,468 