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- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people...
Apr22-11 05:26 AM
ZapperZ
1 45,640
Suppose we have a collection of conductors for which the voltage is specified on some conductors and the surface...
May13-14 03:01 PM
komdu
2 175
Hey, It's a simple question (hope so). How do you know (analitically) wether angular momentum is conserved based...
May13-14 01:49 PM
stevendaryl
12 465
I am trying to calculate the maximum current drawn from a capacitor that is connected to a resistor of a very low...
May13-14 02:37 AM
Pharrahnox
4 251
Hi, In EM theory to derive the 'wave equation for electric field in a conducting medium' we make ρfree to be zero,...
May11-14 02:55 PM
Shan K
18 431
Hi everyone, I have recently been trying to make a nanoemulsion of an aqueous solution by means of Electrospray....
May11-14 02:14 PM
Taylor
4 215
Afternoon all, I am interested to hear any and all suggestions as to how one would go about modelling the rise in...
May11-14 02:09 PM
Chestermiller
4 258
In griffith's intro to electrodynamics (4rth edition), ch. 3, pg. 121. here is the second uniqueness thrm for the...
May11-14 12:20 PM
WannabeNewton
3 315
Hi 1) I am reading Pippard's Classical Thermodynamics and was confused by one of his examples in the attachment. ...
May11-14 09:51 AM
rkmurtyp
68 2,488
Has anyone ever "fired" an electron down the center of an evacuated tube (horizontally) to see if the electron follows...
May11-14 09:20 AM
Vanadium 50
5 363
For any ensemble ##dw=f(p,q,t)\frac{dp dq}{h^{3N}N!}## I do not understand this definition. ##f## is probability...
May11-14 03:22 AM
LagrangeEuler
0 209
Hello, It is said that any process accompanied by dissipating effects is an irreversible process.For...
May11-14 01:57 AM
rkmurtyp
34 1,120
Good afternoon, I am making way through this paper and I am having trouble "seeing" how the linear velocity AE is...
May10-14 11:41 PM
HomogenousCow
7 317
Hello, I am having one question about whether we can realize we are moving in a system, or we think that everything...
May10-14 05:10 PM
Matterwave
1 236
Hello, I am interested in knowing what happens ta wire trough which current is flowing, when an external magnetic,...
May10-14 12:35 PM
UltrafastPED
5 227
here are the two equations i'm dealing with: Eq. 1: $$W=\frac{1}{2}\sum_{i=1}^n q_{i}V(r_{i})$$ Eq. 2:...
May10-14 02:00 AM
Jano L.
7 318
Hi, I am trying to formulate a 2D model to calculate the temperature change over time in a composite material. The...
May9-14 10:46 PM
geetar_king
2 263
It is commonly said (based on a quick Google search) that wrapping your beer in a wet paper towel and placing it in...
May9-14 07:37 PM
Nugatory
28 15,958
My question is on using a form of the single variable Noether's theorem to remember the multiple variable version. ...
May9-14 05:09 PM
bolbteppa
2 244
Hi! I would like to know that in what circumstances Hamilton's canonical equations are superior to the...
May9-14 02:12 AM
UltrafastPED
5 256
Our professor proposed a scenario during lecture that went like this, There is a wire of infinite length that has a...
May8-14 09:31 PM
agonydrum
9 527
Can we calculate the electric field at any given point in space even if there are no charged particles there? The...
May8-14 09:25 PM
jtbell
3 216
Hi, considering the scalar wave equation $$ { \partial^2 u \over \partial t^2 } = c^2 \nabla^2 u $$ (where ∇^2...
May8-14 01:53 PM
the_wolfman
12 556
How is the back induced current in the secondary coil transferred to the primary ? I know how mutual induction occurs...
May8-14 11:45 AM
kira506
16 788
I am trying to follow a Maxwell's equations derivation for light scattering but don't understand 'why' the authors do...
May7-14 03:19 PM
UltrafastPED
8 286
This follows on from an earlier post of mine, which is now closed. I can also now disclose that it refers to my UK...
May7-14 07:00 AM
rprosser
4 317
Let's say that you have an open tank of water and a hose connected to the bottom of it. Water is flowing out of the...
May7-14 05:38 AM
jbriggs444
16 501
This is for a personal engineering project. I need the parametric equations y(t) and x(t) for a very simple pendulum....
May7-14 01:21 AM
Simon Bridge
10 319
(Wasn't sure on the right section for plasma physics, I apologise if this is wrong). I'm reading up right now on...
May7-14 12:48 AM
Jano L.
4 305
Hi I want to develop mechanics of a problem which is as follows. Suppose there is an inverted glass (cylinder)...
May6-14 04:07 PM
Hector92
1 275
Hi All Let me start by saying that I am new to this forum and I am new to physics. I've always had an interest in...
May6-14 12:25 PM
jbriggs444
2 236
I have read numerous explanations as to why it is beneficial to launch a rocket in the eastern direction. I know that...
May6-14 08:24 AM
Lsos
23 651
Why are y and y' treated as independent variables, while they are not? Another slightly related question: if ' =...
May6-14 07:04 AM
UltrafastPED
2 186
If you apply 100 volts to a 10:1 transformer you will end up with 10 volts out. If you put a 10 ohm resistor on the...
May5-14 10:56 AM
enorbet
25 1,072
Using the Coulomb's law, the force between two protons inside a nucleus is about 14.4 N Isn't that a colossal force...
May5-14 09:57 AM
jtbell
3 268
It's a simple question: Why is Ienc in Ampere's Law in a toroid equal to 0NI where N is the number of loops around...
May5-14 08:06 AM
Philip Wood
21 655
Hi, I was wandering, sometimes in physics, to get acceleration from a velocity time graph, you would have to find the...
May5-14 06:12 AM
Chestermiller
2 276
Can anyone give a derivation for the screened potential of a point charge in a plasma in 3 dimensions? Thanks
May5-14 02:35 AM
Shyan
0 213
Hi, I'm trying to build a cat house and I thought I would calculate the exact thickness of insulating material I...
May5-14 12:56 AM
voko
3 281
Hi, I was just going over the moment of inertia for a 2D lamina, Ive been happy with writing the small mass element dM...
May4-14 03:50 PM
paisiello2
1 212
Using differential forms and their picture interpretations, I wonder if it's possible to give a nice geometric &...
May4-14 12:13 PM
marmoset
3 272

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