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

Apr2211 05:26 AM
ZapperZ

1 
47,674 
Hi everyone! I have to do an experiment in the lab related with interference in sound waves with same frecuency. Im...

Feb1313 11:55 AM
!)("/#

2 
539 
Hi everyone...
While going through some texts.. At one place i found that in faraday's law of magnetic induction,...

Feb1811 11:23 PM
Drack1a

23 
3,071 
I am doing a project on strain gauges. I have the thing set up in a halfwheatstone bridge. Using a pair of strain...

Jan404 02:11 AM
Integral

1 
1,842 
Hi all,
I have a (hopefully) quick conceptual question that I'd like to clear up with your help.
Is the...

Aug1814 04:48 PM
"Don't panic!"

16 
437 
So I have read that Hilbert and his student, Hermann Weyl both attempted to "axiomatize" physics. What exactly does...

Dec611 11:20 AM
andrebourbaki

6 
2,251 
Hi guys,
I'm studying a classical ideal gas trapped in a onedimensional harmonic potential and I first want to...

Jul3014 01:35 AM
Jano L.

4 
238 
Can anyone think of a way where friction increases the speed of a moving body, instead of decreasing it? Or prove that...

Feb2206 08:15 PM
nrqed

11 
1,815 
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 
350 
Hi,
I've been doing rotational mechanics at school and at the end of the chapter,the parallel and perpendicular axis...

Jun2609 11:16 AM
Bob S

6 
1,244 
Does anyone know why quarter wave plates and half wave plates have to be multiple order plates (pretty thick plates)...

Apr1711 05:38 AM
*FaerieLight*

0 
749 
Why is it that a dielectric sphere containing free charges, uniformly distributed throughout, has a net electric...

Aug2011 07:50 AM
*FaerieLight*

2 
1,405 
Is it valid to say that an inductor stores power? I know an inductor stores energy in its magnetic field. Power =...

Mar1512 03:54 PM
jim hardy

19 
3,084 
I've just worked out using the method of images that the total induced charge on a grounded hollow conducting sphere...

Mar2413 09:31 AM
stevendaryl

2 
831 
Hi,
I've seen a couple of posts in the Homework section of Physics Forums about the fields of solenoids, but...

Jul413 10:29 AM
BruceW

10 
2,018 
It is said that toroidal inductors/coils (see http://fa.tusofia.bg/te/Brandisky/images/toroidal_coil.jpg) that are...

Aug1512 11:40 AM
dove

1 
1,385 
I've heard that using Lagrangians to solve mechanics problems is much more efficient and easier than using Newton's...

Feb212 08:47 PM
Rap

5 
1,516 
This was shown in a text book about the two body problem, and they compared it to the energy potential of two atoms,...

Jul310 12:39 PM
AJ Bentley

7 
1,716 
Hello and thanks to all who read this. Recently I've just been messing around with air drag equations, trying to...

Nov2808 01:52 PM
Naty1

5 
1,994 
A relatively simple question: Suppose we have a dark nonreflective body at rest in space and hit it with fair amounts...

Dec405 05:35 PM
Tide

10 
1,634 
I was wondering what are the physical properties of water that make it so different from other liquids?
I stand to...

Oct1707 04:11 PM
RA

9 
2,271 
Hello,
I was reading articles about EMR and health and I realized I never got how "output power" is related to...

Aug2713 02:12 PM
Drakkith

1 
567 
i've just started studying these but unfortunatley i've been unable to get my hands on the textbook, and my lecturer...

Mar205 08:02 AM
Andrew Mason

2 
6,321 
If tempertaure means the movement of particles, Can tempertaure be below 0 Kelvin? I mean no movement, vacumm

Jun1610 05:31 PM
pally

23 
7,044 
Could you make a fluorescent lamp with krypton instead of neon or mercury? The wavelength doesnt really matter its...

Apr812 07:15 PM
Andy Resnick

6 
976 
Can somebody help me out here.
The gravity of a black hole is so strong that nothing can escape it, not even light....

Aug1012 08:40 PM
phinds

1 
488 
Hi, I'm new to this forum.
So I do not understand how, in an inelastic system, momentum is conserved.
Consider...

Nov412 01:45 PM
rcgldr

18 
2,429 
Torque is the rotational force.
If there is more force, how can the motor be slow?
I'm building a DC motor and...

Jan1013 05:23 AM
russ_watters

3 
718 
I have a question for which I am intensely confused.
Lets say a car was pushing a big truck from behind. And the...

Sep1113 06:22 PM
DaleSpam

14 
1,081 
Hello, I have a question.
Is the moment calculated:
Force times the distance or
Force's perpendicular...

Oct913 09:13 PM
012anonymousx

3 
972 
I am looking for the simplest possible derivation of the diode equation. I need it to reference to it in my advanced...

Apr2209 06:17 PM
cabraham

5 
19,529 
Why it need to be symetric
From the book Physics  Serway
Thanks
Edit:
I'm bringing just the statment from...

Oct1113 09:11 AM
07685gg

3 
647 
In DC circuit currents can be added if they meet at some point, but in AC current in resistor, inductor and capacitor...

May913 03:07 PM
pumila

1 
400 
https://lh6.googleusercontent.com/3UQ1j2NQaGY/UB_fq85XZdI/AAAAAAAAACM/r0vToMNYhWc/s882/Schematic.jpg
First, I’d...

Aug812 08:36 AM
0lolol0

9 
2,305 
Some basic curve integration leads me to the believe, that if you stack two coils into one another with opposite...

May1909 04:43 PM
0xDEADBEEF

2 
606 
I am looking for the Bfield of a real coil. So a straight piece of pipe with some current density. Is it correct that...

Jun1909 04:32 PM
Bob S

2 
782 
Newtons third law states that there is a counter force to every force. Unfortunately this doesn't seem to work for...

Feb413 10:08 AM
DaleSpam

20 
2,012 
Hello all... I have been working on this problem that I just am not being able to solve.
I've been spending my...

Aug2111 02:14 AM
vanhees71

6 
1,589 
Does entropy decrease when stars are created from a dust?
Does etropy decrease when water freezes?

Aug1912 01:00 PM
Darwin123

2 
615 
Hi all,
I have a question on the movement of a point on a sphere.
Consider a point P(\theta,\phi) (\theta ...

Mar1704 06:46 PM
110

4 
3,553 
I'm writing a game that involves collisions with spheres. Anyway each sphere has both angular and linear velocity....

Jun1910 08:49 PM
K^2

5 
1,098 