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

Apr2211 05:26 AM
ZapperZ

1 
48,224 
A point source of energy often follows the inverse square rule. So if I move my projector back twice as far, the image...

Jun509 04:25 PM
flatmaster

5 
973 
Two balls hit eachother.
One ball with a mass of 2m standing still relative to the earth. The other ball has a mass...

Apr1104 04:53 AM
Lorentz

2 
972 
I would like to further understand rotational inertia. I understand that for a point mass, I = MR^2 and for a...

Apr2605 12:29 PM
arildno

1 
972 
I am solving an advanced problem involving air resistance. I keep coming up with the wrong answer. My question is...

Jan309 06:14 PM
Vanadium 50

1 
972 
it may bit a fuzzy problem but still i have this confusion i.e suppose i have two sphere of same radius & all physical...

Oct1709 07:32 PM
Vanadium 50

7 
972 
Hi,
I'm not quite getting this.
Say we lift a block of weight 10N through a vertical height of 1 metre. So the...

Mar2510 05:02 AM
Doc Al

1 
972 
Hello
I'm new to this forum and i was wondering if anyone here can help me with a problem i'm having.
I am...

Apr1711 01:35 PM
rcgldr

2 
972 
I have spent lot of time trying to understand scattering from Goldstein but in vain. The general equation of an orbit...

Sep1311 06:39 AM
Amith2006

0 
972 
Hi
Say I am looking at an AOM working in the Bragg regime (i.e., only a single diffracted beam). It is easy to show...

Feb1012 01:05 PM
Niles

3 
972 
I think we can't have a negative displacement. Is that right?
Acceleration: the change in displacement / change in...

Mar212 06:17 AM
Doc Al

4 
972 
Hi, my friends. Today, I come up with a question suddenly. It is about Sound diffraction.
why can we hear someone's...

Dec512 02:36 PM
davidm1732

7 
972 
1) If we charge a stacked capacitor like the one in the picture and then remove the leads (red and blue) what will be...

Sep2211 04:53 PM
Philip Wood

3 
971 
Hey guys
I know you're probably going to laugh at me for this question, but what is the name of the pendulum thing...

Apr2206 09:04 PM
simon009988

4 
971 
is it possible to make am em wave of length 5(lamda)....lamda=wavelength of em wave...

Jul211 06:29 AM
phabos

6 
971 
hello forum,
a simple question about EM field and its sources.
In a timevarying situation, maxwell equations...

Oct2908 02:23 PM
fisico30

0 
971 
Hi guys. I am working on making a haptic device for a baseball simulator. Now the problem is that I want to replace...

Mar3010 05:14 PM
DMajor

2 
971 
Okay, since the most fluids I've studied are from the Euler equation in the context of plasma physics I may be asking...

Nov310 01:04 AM
cjl

2 
971 
why dont magnetic monopoles exist??

May1711 11:23 AM
santo35

3 
971 
My question concerns a wave traveling from a dense into a less dense medium. Is it possible that the amplitude of the...

Aug1611 08:53 AM
chrisbaird

2 
971 
A billiard ball is cued by striking it horizontally at a distance d=10mm above the center of the ball. The ball has...

Mar2712 05:47 PM
berkeman

2 
971 
When i apply torque on a body, it will rotate around whcih axis? I guess its the axis along centre of mass but i don't...

Apr2712 08:43 AM
mfb

3 
971 
Hi,
Consider a block of mass M connected to a spring of mass m and stiffness k horizontally on a frictionless...

Feb1913 05:49 AM
bgq

3 
971 
Dear friends this question is really annoying me .plz. help me in understanding this question and the concepts...

Nov1204 09:34 AM
Integral

1 
970 
We all know that to each action there is a responsive reaction. Let's take the case of a falling ball. Ignoring...

Apr605 04:58 PM
Werg22

6 
970 
Why is it in kinetic theory one uses the velocity variable, instead of the momentum variable? Wouldn't this cause...

Mar2809 10:31 AM
Pinu7

4 
970 
what is the theory behind ....if close integral of a expression is zero..then the expression is itself zero

Sep2209 01:24 AM
Born2bwire

1 
970 
1)The torque of the weight of any body about any vertical axis is 0. Is it always true?
2)A sphere rolls on a...

Sep310 10:51 AM
Ketman

3 
970 
Hello,
This is kind of a simple question but if an EM wave is propagating in the positive x direction and the E field...

Dec1611 08:59 PM
Simon Bridge

1 
970 
hi
im really confused about the exact heat transfer mechanism of the phenomenon i observed
the situations simple:...

Mar2112 03:00 PM
uniqueboy

0 
970 
Hi,
Do material posses both dielectric as well as resistance properties?
I imagine that when there is a...

Nov3012 11:40 AM
Apteronotus

3 
970 
in the picture below
http://tinypic.com/view.php?pic=9riq9l&s=6
if we know the angular velocity of the...

Mar313 01:23 PM
Andrew Mason

7 
970 
If i measure a weight on earth without moving in any
direction, it weighs 10kg. Suppose I'm moving upwards in
a...

Sep2913 02:33 PM
TurtleMeister

12 
970 
This is from Wikipedia:
1. What is really meant by "selfpropagating", how it works?
2. How many electric...

Aug1414 06:21 PM
pleco

44 
970 
Reading Jackson this morning, where it was stated that the Lorentz force equations:
\frac{dU^\alpha}{d\tau} =...

Sep2209 10:43 AM
Peeter

6 
969 
I was at a symposium the other day where the speaker was discussing the ability to create an AC current using a...

Aug711 10:33 AM
Enthalpy

1 
969 
wrong place sorry

Feb1112 07:12 AM
Mulecc

0 
969 
Eisberg and Resnick says that the condition for stability of the atom is:
k Ze2/r2=mv2/r
What I fail to...

Mar612 03:34 PM
Philip Wood

1 
969 
when light waves interfere, it is said that when the troughs of both the waves (say) coincide, destructive...

May2512 06:25 AM
Zubeen

1 
969 
A little while ago I asked: why does wind feel cold. The molecules are moving faster so it should feel hot. The...

Oct2712 06:19 PM
Chestermiller

5 
969 
+++++++++++++++
charge here

May113 04:53 AM
phinds

1 
969 