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Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
41,736 
I am undergoing a product development as part of my full time business. I have forgotten a lot of the Physics I learnt...

Dec405 07:35 PM
bkelly

12 
16,582 
Hi there!
What is the equation of the temperature increase when the ideal gas swept by a planar shock wave (Mach...

Jan2612 11:46 AM
boneh3ad

10 
1,239 
I've been trying to figure this out for long now but unfortunally, I'm not able to prove that ∇E = 0 in an Ohmic, 2d...

Apr3013 06:46 AM
ManDay

0 
433 
The equation for the change in momentum for total absorption of electromagnetic radiation is ΔU/c and that for total...

Apr2113 01:07 AM
virtuosowanaB

2 
395 
Hi all,
I stumbled on a derivation of the Larmor's equation for the power radiated by an
accelerating charge...

Jun3011 12:52 PM
SinghRP

6 
4,073 
Hi,
I am reading a fluid dynamics paper about dissipation due to turbulence in the fluid causing "Bernoulli loss"....

Jan1612 06:35 PM
boneh3ad

1 
856 
These bullets supposedly will penetrate body armor, but not drywall, and are alleged to pretty well explode when going...

Aug1910 06:30 PM
turbo

8 
4,247 
Say you have a cylinder of radius r with πr2h liters of water in it. If you put it on some sort of turntable and spin...

Oct205 08:37 PM
amcavoy

9 
3,582 
Here is a problem I have been trying in Maple, but to no avail.
I am trying to calculate the theta that will result...

Oct604 01:09 AM
Machinus

16 
2,284 
We are taught the notion of heat capacity in undergraduate physics and how different materials can hold a different...

Dec2213 09:52 AM
sophiecentaur

12 
472 
If someone is running and jumps onto a merrygoround, momentum is still conserved, correct? (ignoring friction). So,...

Jul711 10:00 PM
Jaevko

1 
2,762 
Hello everyone,
I am reading Daniel Schroeder's Thermal Physics book. One phrase he uses that I find particular...

Mar914 07:29 PM
Andrew Mason

1 
185 
The wikipedia article I quote below is confusing me. I followed the links to Frank Lambert's website, where he claims...

Jul113 02:26 PM
andrebourbaki

39 
6,920 
I found a case like this:
A box is moving upward (to the right) in a 30 degree angle from the ground. Inside the box...

Mar2012 09:57 AM
science_world

0 
726 
This bothers me a bit:
Gases? You include in the chapter of "fluid mechanics" gases? These are two different...

Jul1511 05:15 PM
I like Serena

31 
3,168 
L = \frac{\partial \Phi}{\partial \left(cos \Theta \right) \ \partial \Omega}
What is this quantity? I mean, I...

Sep508 12:25 PM
Somefantastik

3 
1,575 
So I'm pretty sure the following paragraph is all true. Do the citizens of PhysicsForums agree? Please confirm and/or...

Sep1212 03:40 AM
vanhees71

2 
1,403 
In my classical mechanics class, my professor derived an equation for the total kinetic energy of a rotating rigid...

Dec808 08:13 PM
pimpalicous

0 
878 
Ooh yes, I do have two question. So enjoy the meal all physics lovers! :smile:
1. If the field is increased...

Nov610 02:26 AM
kinley

14 
7,915 
Hi.
My English is not perfect but I'll try my best. This is not a homework. It's a programming question for my...

Jan2610 10:04 AM
DocZaius

7 
1,646 
I've ran into a "paradox" concerning deriving the energy of a dipole's orientation in an external field. For example,...

Mar1809 09:18 AM
Hans de Vries

80 
10,904 
Greetings, physicists and others, who just happen to understand physics. Something is bothering my mind again and I am...

Aug2413 01:04 PM
baudrunner

6 
481 
Hello, I was reading A. O. Barut's Electrodynamics and Classical Theory of Fields and Particles and was interested by...

Dec906 02:38 AM
dextercioby

3 
2,534 
I'm trying to model the electromagnetic vector potential, does the following come close for 1 + 1 dimension...

Feb213 06:49 PM
Spinnor

0 
456 
Under "Dynamics", an Inertial frame of Reference can be defined absolutely as one that does not use "pseudo" or...

Dec1404 07:15 AM
mani

7 
1,735 
Can "smoke" ring be blown with only air (withouth smoke) in cold?

Feb1211 11:08 AM
klimatos

1 
960 
Is it correct to say that a field (i.e. electric) travels at the speed of light?
We've been taught that only...

Mar2007 10:54 PM
BeauGeste

2 
1,221 
A block has an initial velocity of V and is connected to a damper and a spring like this:
...

Dec1812 10:59 AM
Zetor

0 
572 
Hello there, looks like a fantastic forum here. I got a problem popped up during my work, hope you can help me out.
...

May2511 12:34 PM
Khashishi

3 
1,103 
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 
306 
Last winter, I had a storebought bottle of water I took snow camping. The closed bottle of water sat in the snow...

Dec909 01:52 AM
Borek

4 
2,441 
I don't understand this concept very well. Is it like taking the energy each possible configuration and adding them...

Nov2413 12:43 AM
wotanub

6 
475 
I have been recently calculating tensors of inertia of sphere and seimisphere. Although I expected that tensor of...

Apr504 08:15 AM
tomkeus

0 
1,343 
I got my information on speeds of sound through various materials from this page:...

Aug707 02:29 PM
mgb_phys

1 
2,087 
Difficult to put the topics on the right place...
Is there any spring (or any physical method) that could have...

Oct203 03:53 PM
rdt2

3 
10,096 
First off, let me apologize if this thread is in the wrong location. Secondly, let me also say that I did search this...

Sep1910 02:30 PM
Freerefill

0 
2,032 
Hello there,
I was not sure if this belonged in the Classical Physics forum or the General Physics forum, so my...

Apr1512 11:11 AM
Ken G

2 
973 
Hello PF. I thought this would be a good place to ask around for information pertaining to "where we are at" in...

May2612 03:05 PM
Inve

2 
961 
I want to build a metal wood stove that has much higher thermal conductivity than steel.
I want to find a metal/alloy...

Jan1109 11:06 PM
blackfish

0 
1,236 
Does anyone know how either Lienard or Wiechert justified the (1v/c) factor that appears in their potential formula...

Sep1609 03:05 PM
clem

3 
934 