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

Apr2211 05:26 AM
ZapperZ

1 
41,749 
Since Newton's times, many people (including Newton himself, I think) have felt dissatisfaction with the theory of...

Aug1613 08:26 PM
king vitamin

12 
1,535 
hello :)
let's look at the following functions:
Langevin function L(x)=ctgh(x)1/x
Brillouin function B(x)=f(x...

Aug1713 04:55 PM
LagrangeEuler

1 
1,000 
Its been many years since i studied mechanics at school and I need to know how to calculate the force applied to a...

Aug1413 10:50 AM
Nugatory

5 
991 
Hey,
Got into a discussion with my friends over this:
If you spin in your chair clockwise, since the earth spins...

Aug1513 05:16 PM
A.T.

7 
718 
Hello everyone.
I'm really struggling to simulate a cavity problem.
My goal is to be able to know what's going...

Aug1413 08:37 AM
ChristinaJ

3 
374 
Basically my question is this: could we, in principle, formulate all of classical electromagnetic theory purely in...

Aug1513 04:08 PM
Jano L.

7 
606 
My friends and I have thought about this for a few years now and still can't come to a conclusion.
If an electronic...

Aug1513 03:38 PM
chrisbaird

2 
397 
Consider a unit volume (rigid walled container of surface area S) containing N molecules with diameter d, having a...

Aug1513 02:52 PM
erielb

4 
485 
A ball is attached with a string on the side. When the string is pulled up, static friction accelerates the ball...

Aug1713 08:56 AM
bgq

7 
758 
In the absence of external forces, the electric field inside a conductor is supposed to go to zero. This is because if...

Aug1513 03:27 PM
chrisbaird

4 
442 
I am watching Susskind's derivation of Newton's F=ma from the EulerLagrange equations (53 minutes in) here...

Aug1413 02:50 PM
MrRobotoToo

15 
964 
What's the difference between impulse and momentum ?
When do we use impulse or when do we say a body has impulse ?

Aug1713 02:00 PM
Jadaav

7 
1,087 
In case of a transmission line consisting of two wires in parallel (aka Balanced line) the characteristic impedance Z0...

Aug1713 04:43 AM
sophiecentaur

38 
1,291 
I am having a hard time figuring out how to calculate the velocity of a mass in a springmass system with respect to...

Aug1413 08:24 AM
Jwil

2 
561 
I want to calculate the vibrational energy of vibrating water drops. To start with I assume water is inviscid.
The...

Aug1413 07:17 AM
M_1

0 
289 
Hi, could anyone help me understand the permittivity of free space in Gauss's Law:
\Phi = q/\epsilon0
If you...

Aug1513 02:20 PM
Khashishi

2 
360 
Lets say an archer shoots an arrow or a gun fires a bullet, why is it that a lighter objects (arrow and a bullet) gain...

Aug1513 01:42 PM
DaleSpam

36 
1,040 
This is something I don't relly get. I keep reading that the intensity of a wave is proportional to the square of its...

Aug1413 04:51 PM
Drakkith

2 
319 
Hello, I'm studying The Theory of Polymer Dynamics by Doi and Edwards and on page 98 there is a tensor, defined as a...

Aug1413 08:48 AM
Irid

2 
382 
I'm looking for an equation similar to the change in forward momentum equation:
Δmv=f*Δt
But for angular...

Aug1513 10:59 PM
D H

6 
616 
In many textbooks, a proof is provided where the work output of a superefficient heat engine is provided to a carnot...

Aug1413 09:06 AM
Andrew Mason

3 
442 
So I'm having a very difficult time understanding how motor driven rollers are able to create different tension zone...

Aug1613 12:53 PM
Chestermiller

7 
384 
Hello! I have a few doubts in circular motion and I'd really appreciate your help :)
1) There is a statement in my...

Aug1713 09:00 AM
bgq

5 
462 
I'm not sure if this is the appropriate forum for my question as I actually am studying this as part of electrical...

Aug1613 08:38 AM
Claude Bile

5 
382 
Hej Guys,
I am just wondering. See the picture.
http://s9.postimg.org/s8k1k62mn/weights.jpg
If I put 5kg on...

Aug1513 02:35 PM
losbellos

4 
392 
Firstly, I am new to this forum and this is my first post, so if I've posted to the wrong place or somehow violated a...

Aug1713 03:05 PM
CapnDub

5 
474 
Hey ya'll!
I've come to the Physics Forum when I needed help with homework, but only to observe. This is my first...

Aug1613 01:59 AM
EthanNino

0 
347 
i am a junior physics student; i have already been exposed to the equation many times. Now i am more interested in...

Aug1713 11:10 AM
Philip Wood

4 
434 
i have an intuition of electric field lines, and force. All quantities yielded from an operation between two...

Aug1613 05:28 PM
Astrum

4 
471 
I am struggling with a derivation that calculates the cross sections for Mie scattering and since the incident light...

Aug1613 05:02 AM
Gavroy

0 
263 
Hello,
I was playing with single mass point classical mechanics, when I realized that the dot product of the...

Aug1713 08:05 AM
DaleSpam

3 
454 
helo,
I have a couple of forces described in f''(t), and the f'(t) yields a momentum vector plane like pic:
...

Aug1613 11:20 PM
'roidbreaker

2 
307 
Hi guys,
I'm wondering if I roll a barrel which rolls without slipping down an inclined plane vs. a barrel which...

Aug1713 02:39 PM
dislect

5 
407 
This is rather strange and has been bugging me, from chapter 22 (Electric fields) of Resnick & Halliday:
So suppose...

Aug1713 07:39 PM
voko

5 
412 
Hi guys,
Heard an interview question from a friend, the guy asked him what happens to a disk with internal radius r...

Aug1813 08:48 AM
dislect

2 
267 
Hi all,
what do you understand by a hardpoint gas?, I mean in terms of its hamiltonian.
Thanks in advance.

Aug1813 05:10 PM
Jorriss

3 
297 
Hello everyone obviously smarter than I. There is an answer I seek, to a project that is willing to be done.
I'm...

Aug1813 08:54 AM
Vanadium 50

7 
356 
Hey guys, I was just stuck on this idea. I know that in the classical sense, light or any kind of electromagnetic...

Aug1813 05:55 PM
jtbell

5 
427 
Hello,
if I think of the harmonic oscillator action S = ∫L dt, L = 1/2 (dx/dt)^2  1/2 x^2, and then of the...

Aug1813 02:14 PM
marfi11

0 
303 
Hello everyone,
What does it mean if I integrate Newton's law of universal gravitation with respect to r.
F=...

Aug1813 07:28 PM
Astrum

4 
430 