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

Apr2211 05:26 AM
ZapperZ

1 
45,729 
Please disregard this post

Oct1712 12:54 AM
1101

0 
826 
How fast is speed of signal between 2 atoms ?
Is it speed of light in electric field and then it slows down to speed...

Oct1612 09:50 PM
Drakkith

3 
875 
Hello!
I am interested in building a cyclotron. Since I doubt that I will be compotent enough to build a cyclotron...

Oct1612 08:59 PM
Vanadium 50

23 
1,336 
Question for the brilliant minds around here:
I'm trying to figure the amount of torque (I*a) needed to rotate a...

Oct1612 01:18 PM
alevesque

4 
1,439 
So I need a motor that is able to provide \begin{equation}0.412Nm\end{equation} of continuous torque (to overcome...

Oct1612 08:02 AM
CWatters

5 
1,309 
I have to admit I don't really understand this theorem fully. As far as I understand it says that the work done on a...

Oct1612 07:07 AM
Qreeus

3 
1,088 
Imagine a dielectric cylinder placed in a uniform magnetic field parallel to its axis.
Then we make it rotate around...

Oct1612 02:24 AM
DrDu

13 
1,485 
Is there any known method to convert straight into electrical energy?
without all that 'steam' part? xD

Oct1512 08:10 PM
russ_watters

8 
942 
I'm having trouble understanding what happens to the internal energy of an ideal gas being compressed adiabatically.
...

Oct1512 06:17 PM
aa1607

2 
1,445 
Hey, I was just playing about with some lagrangian mechanics and tried to work out the angular momentum of the earth;...

Oct1512 05:56 PM
TheDragon

2 
1,010 
A 200 kg canoe lies at rest in the water, near a dock but untethered. Any
friction between the canoe and the water is...

Oct1512 01:49 PM
haruspex

1 
1,118 
Hello all. I'm a newer engineer in rotor dynamics trying to better understand some things, so perhaps someone can...

Oct1512 11:54 AM
mfb

6 
1,503 
Is it because for there to be work there must be heat entering the system, which is what is really causing the...

Oct1512 11:06 AM
raopeng

4 
891 
Hello
I wrote a simple simulation of an 2D ideal gas, with elastic collisions. I wonder how should I simulate the...

Oct1512 06:31 AM
mikeph

3 
853 
Title says it all, confused as to how I'm supposed to define the phase space of a system, in my lecture notes I have...

Oct1512 12:17 AM
capandbells

4 
1,002 
Hi, I am working on an example that demonstrates Newtons laws in 3dimensions (this is NOT homework). In my example I...

Oct1412 04:49 PM
Vanadium 50

1 
733 
Hello, if I put two plates one in front of the other and apply a voltage I read that an electric field creates, but...

Oct1412 04:18 PM
scientifico

3 
680 
I'm a bit confused about the effect of the size of ferromagnetic material on the magnetic field it generates so I was...

Oct1412 04:04 PM
Per Oni

2 
684 
Hi all,
I am brand new here and need some help  i hope it is the right category i am posting in.
I am no...

Oct1412 12:25 PM
haruspex

5 
1,449 
So I just wanted to clarify:
Because D = ε0E + P
P being zero in vacuum
and ∇D is constant regardless of...

Oct1412 12:08 PM
Danen

2 
547 
Hi! I have attached the picture. Can someone please tell me what equation of motion will be?
My guess is that it will...

Oct1312 05:43 PM
mfb

3 
585 
Hi!
The damped oscillator equation is as follows:
x(t)= A exp(γt/2) cos(ωt)
where ω= √( (w0)^2 + (γ^2)/4 )
I...

Oct1312 12:25 PM
Philip Wood

6 
628 
Consider a simple two particle system with two point masses of mass m at x1 and x2 with a potential energy relative to...

Oct1312 11:16 AM
mfb

6 
881 
In a heat transfer with internal heat generation what does the term "internal heat generation" mean?
Is that...

Oct1312 10:07 AM
Chestermiller

3 
1,368 
Hi,
I'm writing a small studentpaper on heat pumps, and I'm not at the point where i explain the physics behind...

Oct1312 09:50 AM
andrien

1 
2,385 
I'm investigating the phenomenon of sonoluminescence. A quick search has yielded the RayleighPlesset equation as...

Oct1312 09:46 AM
Ashiataka

2 
707 
Do you know some example of an operator, other than momentum or position, that has (at least partially) continuous...

Oct1312 09:16 AM
Jano L.

3 
683 
The heat equation predicts that heat spreads infinitely far over arbitrarily small time intervals. What happens in...

Oct1312 09:04 AM
espen180

1 
821 
Last semester I did a project for grade 12 physics where I had to account for air resistance in projectile motion. I...

Oct1312 06:09 AM
mfb

3 
1,166 
Hi there,
I'm trying to create a sheet that produces a uniform magnetic field,using either rectangular or...

Oct1312 05:17 AM
Qreeus

4 
812 
The function for simple harmonic oscillation is:
Acos(ωT)+\phi
Why is there an angle phi added to the function...

Oct1212 10:09 PM
CrazyNeutrino

8 
2,155 
Not sure if this should be in quantum section, please move if necessary.
We know that:
1. A stationary particle...

Oct1212 05:17 PM
Jano L.

2 
1,083 
I have a small pump system for an aquarium, and have decided to build a small manifold. The total volume of the...

Oct1212 01:23 PM
jakestenson

3 
1,009 
In a Faraday flashlight, a magnet is shaken to and fro in a solenoid to induce an EMF and thus current. Something like...

Oct1212 12:19 PM
Qreeus

5 
1,320 
we set limits by what we can measure; therefore, it is what we have. This is my general understanding. I think it...

Oct1212 08:09 AM
Qreeus

16 
2,382 
This is a simple enough question, but no one has been able to give me a satisfying explanation. Most people compare...

Oct1212 05:51 AM
CWatters

25 
10,180 
When people talk about sunspots and the solar cycle and stuff like that, they often mention magnetic field lines...

Oct1212 05:16 AM
Qreeus

3 
963 
I was wondering, after discovering that in particular scenarios atoms can release photons, how they do it? Is some of...

Oct1212 04:26 AM
Drakkith

6 
1,210 
I am very confused with a particular aspect of part of my physics curriculum.
Let's say there is an object swinging...

Oct1212 02:46 AM
Simon Bridge

1 
1,260 
I was wondering that since most forms of energy can either be in wave or particle form, (example; photons and...

Oct1212 12:26 AM
Drakkith

5 
1,041 