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

Apr2211 05:26 AM
ZapperZ

1 
47,892 
By "static" in this thread, I mean the charge and current density is constant in time (so things can be moving, but...

Nov109 01:30 AM
JustinLevy

5 
1,249 
I recently read an article about Joseph Kittinger which stated that in a skydive, he was subjected to a G force of 22...

Oct3109 08:53 PM
Phrak

17 
2,190 
We find the equivalent resistance(let us denote it by R) of an infinitely long ladder circuit by considering that it...

Oct3109 06:56 PM
PhDorBust

3 
4,257 
Hey all,
I have a lab coming up that deals with the emission spectra of H, He,Ne,Hg, and N_2
I am looking around...

Oct3109 06:34 PM
blkqi

3 
955 
Hm just having a little problem with this which should only take a second to check, trust me I have used the search...

Oct3109 04:56 PM
Doc Al

10 
1,559 
I read that the centrifugal force acts radially outwards on a stone being revolved by a person with a string. But I...

Oct3109 07:56 AM
Dadface

41 
3,184 
Um, I suppose this is very basic but I just got kind of confused.
Okay suppose you are standing and swinging a rope...

Oct3109 05:40 AM
BobbyBear

17 
4,115 
So just to verify (i'm not sure about this):
The electric field inside a conductor is zero?
the electric field...

Oct3009 10:32 PM
MaxwellsDemon

1 
906 
When working out circuits problems, can we consider a voltmeter to read the difference in the scalar potential between...

Oct3009 08:05 PM
JustinLevy

4 
2,515 
I'm currently trying to look into the optics of extended sources. Google doesn't seem too helpful.
Anyway, I have...

Oct3009 07:32 PM
Andy Resnick

1 
800 
I know light is the fastest thing in the universe. But what about forces, namely gravity, magnetism, strong and weak...

Oct3009 12:10 PM
Sorry!

67 
8,261 
Hi everyone
Long time since i posted something.
(May be i have posted at the wrong place, Doc Al...feel free to...

Oct3009 08:55 AM
FedEx

5 
1,739 
I implemented collisions with walls in my Java physics engine, complete with elasticity and friction, but I am not...

Oct3009 08:00 AM
MTK

1 
1,034 
Ordinarily, a system of N particles in d dimensions has 2Nd constants of motion, but there are certain invariants,...

Oct3009 04:45 AM
Gerenuk

9 
1,056 
Hi,
I have been trying to find the (causal) Green's function of
\frac{\partial^2 \phi}{\partial t^2} +...

Oct2909 11:50 PM
Born2bwire

5 
4,442 
I don't understand why a rotating gyroscope whose rotation axis is inclined with respect to a vertical axis does not...

Oct2909 09:11 PM
fluidistic

40 
10,841 
So I am doing a practical on the Zeeman effect, and have not been able to find an answer to the following:
The...

Oct2909 12:20 PM
joshd

0 
1,055 
I would like to find an equation to calculate the evaporate rates of water under a vacuum ranging from 2628 inHg, a...

Oct2909 01:50 AM
Telruc

0 
1,044 
Hi,
Could somebody pls give details on how extinction spectrum can be calculated. In several books I refered,...

Oct2909 12:30 AM
krindik

0 
6,461 
So my professor has been kind of lazy lately. he goes through a lot of problems on the chalkboard half way till he...

Oct2809 11:41 PM
cesiumfrog

2 
751 
I'm thinking about generalizations of Lagrangian mechanics to systems with infinitely many degrees of freedom, but...

Oct2809 11:56 AM
saibod

1 
2,529 
The figure shows an insulating ring and an infinite straight wire resting on the surface of an infinite plane. The...

Oct2809 11:17 AM
cpcolts

0 
1,011 
I have a heat transfer question, I work in a plant and am doing a reinsulation project. If an unexposed steel steam...

Oct2809 12:29 AM
berkeman

4 
6,643 
If so, why? Shouldn't it attract positive charges equally from all sides?

Oct2709 07:19 PM
kashiark

10 
1,759 
Let's say I were to place a test charge, q0, in a standard electric field E = k*q1/(r^2).
How would I find the...

Oct2709 04:27 PM
tickle_monste

3 
2,006 
I am trying to code a 2D rigid body physics engine in Java, and I am having some trouble figuring out how an object...

Oct2709 03:43 PM
MTK

15 
2,824 
Hi,
In gravitational force law F=G\frac{M_{1}M_{2}}{x^{2}}if i want to find the distance function which depends on...

Oct2709 03:15 PM
coki2000

11 
2,946 
I know how to figure out how much energy is needed to acclerate to a certain speed. What I don't know is how much...

Oct2709 11:11 AM
PatPwnt

1 
1,406 
In the vicinity of antenna, electric field strength have terms that vary as 1/r, 1/(r^2), and 1/(r^3). The terms...

Oct2709 05:59 AM
hectoryx

0 
865 
What are the problems in Newton's law of universal gravitation? Please explain using simple physics if possible.

Oct2709 05:40 AM
ZapperZ

6 
1,583 
Hello fellow physicists!
This is a problem out of my graduate E&M course, and I was hoping some of y'all might have...

Oct2609 11:01 PM
Magnesium

7 
3,616 
Hello. I'm new here to the Physics Forum, but I was hoping I could contribute.
While I was in high school, my...

Oct2609 08:14 PM
Gerenuk

7 
1,152 
just out of curiosity  it seems evident to me that the capacitance of a conductive body should be between the...

Oct2609 07:52 PM
bhh1988

0 
1,614 
I was doing this experiment with the setup which as follows. You have long aluminium bar which as 28 masses attached...

Oct2609 07:43 PM
Andy Resnick

1 
781 
Is it possible to create a strong enough (artificial) magnetic field to stop high energy particles? Much like the...

Oct2609 04:31 PM
nickdk

8 
1,119 
Today (251009) I visited beach on the west coast with clearly south wind.
Looking to the waves, there were some...

Oct2609 02:22 PM
JANm

2 
624 
Hi, a search on google will reveal that an ocean wave is both transverse, and longitudinal. Another search will also...

Oct2609 02:02 PM
pinguthepengu

2 
1,875 
I have one question. If I have Hamiltonian:
H=\sum^{f_1}_{i=1}\alpha_iq_i^2+\sum^{f_2}_{i=1}\beta_ip_i^2
I can...

Oct2609 01:00 PM
Petar Mali

2 
2,007 
hey there, my question is just regarding nonlinear resistors, basically if you had a situation whereby the current...

Oct2609 08:13 AM
Chewy0087

5 
1,274 
Is given by
v2 = 2P/ρ
Where P is the pressure and ρ is the density of water.
What exactly do you mean by...

Oct2609 01:51 AM
dE_logics

9 
5,160 