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

Apr2211 05:26 AM
ZapperZ

1 
45,863 
I was playing around with some manipulations of maxwell's equations and seeing if I could work out the wave equation...

Jul1508 05:00 PM
Andy Resnick

3 
950 
Hi. I'll start off by saying I have a background in mathematics, but not in physics. If I use the wrong term, I...

Jul1508 02:17 PM
rcgldr

5 
1,128 
Hey everyone. First post here. Sorry if this is the wrong place. Force calculation seems to fall under classic...

Jul1408 11:33 PM
lukahn12

2 
1,148 
Are there any other math/physics/engineering runners out there who are interested in collaborating on an effort to...

Jul1408 06:19 PM
juliasantanna

1 
4,202 
Hello! I'm very new to these forums so please pardon my ignorance.
When you twirl a mass on a string horizontally...

Jul1408 05:56 PM
Doc Al

6 
2,439 
Why do we apply law of conservation of linear momentum on a body that explodes in air when an external force,...

Jul1408 08:35 AM
pardesi

8 
2,459 
Hi all,
Some time ago I watched this video about an intraterrestrial elevator. It is about a theoretical elevator...

Jul1408 06:06 AM
Gear300

4 
1,372 
Hmm how does one prove that a lagrangian is a function of just the generalized coordinates and the generalized speed...

Jul1408 03:19 AM
pardesi

2 
1,157 
BACKGROUND:
I am doing an experiment determining the young's modulus of a cantilever through principles of SHM (i.e....

Jul1308 07:05 AM
tinytim

4 
4,045 
1975 the roof of the Montreal Velódromo which weighed 3.7x107N was raised 10cm to be centralized. What the work...

Jul1208 10:10 PM
kateman

1 
1,412 
There is a EM radiation of frequency suppose x Hz.Let it has to travel a distance of y m.Now what's the time required...

Jul1208 06:10 PM
Andy Resnick

3 
1,323 
Hi.
I'm having some problem solving this problem: Consider a 3 body elastic collision; 3 bodies on 1 axe; both have...

Jul1208 06:16 AM
BobMonahon

1 
3,249 
Can anyone give a simple explanation to generalised cordinates in Lagarangian/hamiltonian mechanics

Jul1108 03:02 PM
Oberst Villa

2 
1,220 
For an ideal gas PV=nRT where n is the number of moles show that the heat transferred can be written as:
dQ =...

Jul1108 10:43 AM
Andrew Mason

1 
1,381 
Lets assume we have a resistor material, with a perfect solid spherical shape and no defect, we connect it from south...

Jul1108 08:44 AM
cabraham

4 
7,886 
I've been searching through the internet and some of my optics books, but nowhere was I able to find the derivation of...

Jul1108 03:49 AM
r4nd0m

10 
4,031 
In multipole, the electric quadrupople interaction with incident electric field:
...

Jul1008 11:29 PM
BiBByLin

0 
1,584 
the link below should take you to a google book called "principles of nanooptics" by novotny and hecht. my question...

Jul1008 10:38 PM
BiBByLin

2 
1,496 
OK. I have been fighting with my pen and paper for hours trying to fathom this:
I have been thinking about that...

Jul1008 09:18 PM
rcgldr

13 
2,389 
does the electromagnetic spectrum limited?
whate is the theorical answers for limitation of the spectrum?

Jul1008 07:23 PM
lightingbolt1

3 
1,186 
A friend asked me this question:
There is a capacitor with capacitance C, charge Q on either plate and an electric...

Jul908 04:43 PM
DrZoidberg

15 
2,041 
I have never understood how images are reflected in mirrors, even now that I am going into my fourth year of...

Jul908 04:02 PM
madness

13 
2,299 
let's suppose i have two differently pressurized balloons and i push them together. how can i predict what that...

Jul908 03:24 PM
vipulsilwal

3 
1,324 
If a hole is somehow made to pass straight through the center of the Earth, and out on the opposite side, what would...

Jul908 03:17 PM
glueball8

9 
2,314 
Hi
Are there any exciting experiments for the conservation of linear momentum?

Jul908 01:19 PM
velocity

5 
1,195 
Does the electromagnetic or acoustic resonant frequency of a hallow spherical object ever equal the circumference of...

Jul908 11:08 AM
marcusl

11 
6,515 
Question:
Analyze the motion of a small bead attached to a wire which is rotating along a fixed axis?
Proof(Using...

Jul908 10:06 AM
marcusl

1 
974 
As an example, if you raise your arms in front of you, your center of mass will move slightly forward. However, you...

Jul908 08:39 AM
jtbell

6 
1,326 
Hi guys, I am selfstudying physics, but I am confused for something following:
given 1d motion of an object o, we...

Jul908 04:55 AM
Doc Al

10 
2,043 
It's been a while since I've studied mechanics. Would someone remind me as to the equation for the deflection of a...

Jul808 10:56 PM
Defennder

1 
2,241 
Hello all,
I have a quick question. If i put two identical mirrors right next to each other on the same surface at...

Jul808 01:38 PM
DaveC426913

3 
1,834 
Is there a particularly good reason that angular momentum was defined as the cross product of position and linear...

Jul808 10:18 AM
Peeter

34 
4,429 
i have been confusing according this picture which is taken from...

Jul808 09:49 AM
cmos

1 
940 
I was wondering why temperatures are so low out there in the vacuum of outer space? my understanding is that a...

Jul708 08:41 PM
Andy Resnick

10 
2,514 
Take a two sound waves: for example let us spread them at both poles of the human hearing spectrum. The low frequency...

Jul708 06:13 PM
tiale11

3 
6,502 
Hi there,
I am doing physics as level and i am finding it very difficult especially the projectiles. I am unable to...

Jul708 03:35 PM
hasnain721

3 
1,178 
Well, we all know that the farther you move the point of force application from the point of rotation, the greater the...

Jul708 12:40 PM
teodorakis

19 
13,489 
Ok, I have a general question about centrifugal force.
Lets say I have an object who moves in a circular path, we...

Jul708 12:05 PM
cristo

117 
15,067 
An EM Field is described as follows :
The electromagnetic field is a physical field produced by electrically...

Jul708 09:05 AM
Domenicaccio

2 
969 
Hi!
I've really been wondering how air can possibly get cooled with a fan. I read somewhere on the internet that a...

Jul708 08:54 AM
Domenicaccio

6 
1,829 