the rudyak-krasnolutski effective potencial
Hi ... anyone now how to calculate or the formula of the rudyak-krasnolutski EFFECTIVE potencial ? the effective potencial includes the angular momentum of the particle ... thanks
View ArticleQuestion of reflection and transmission of TEM wave in normal incidenc
Suppose TEM wave in +z normal to a boundary on xy plane at z=0. We know E & H are tangential to the boundary. Let ##\vec E_i=\hat x E##, be the incident wave towards the boundary therefore incident...
View Articlequestion on coriolis effect with drag force
I really need help with this question. A small floating object initially moves with velocity v on the surface of a liquid at latitude λ. The drag force due to liquid is F=-αv. Find the shape of the...
View ArticleWhy angle of projectile has 2 solutions?
I have the final answer of: sin2(theta) = 0.871 why does (theta) = 30.3 deg OR (theta) = 59.7 deg I get why this could be physically, but I'm not sure why mathematically?
View ArticleElectric field between parallel plate capacitor
If you have an infinite non-conducting plate, the electric field just outside is equal to sigma / 2*epsilon. The electric field just outside a conductor is equal to sigma / epsilon. I understand both...
View ArticleChange in flux of a transformer
Hello, As I understand, a simple transformer works by using the Input AC in the primary coil to generate magnetic field in the iron core, which then generates an AC in the secondary coil. My question...
View ArticleBasic physics understanding. Could someone explain?
I'm trying to get a grip on some classic physics by watching a Stanford lecture. I've made it through the first one, and now in the second one all the professor ever talks about is 'derivatives'...
View ArticleIs this plasma (picture in thread)
http://postimg.org/image/d530nwobf/ those are plasma arcs emitting from the gun no? Ionized air?
View ArticleClik here to view.
Question in reflection and transmission at oblique incidence.
I am reading Griffiths p387. It is my understanding that [tex]\tilde E(\vec r,t)=\hat r E_0 e^{j(\omega t-kr)}[/tex] Where ##\vec r =\hat x x+\hat y y+ \hat z z## is the positional vector from the...
View ArticleClik here to view.
Please check what's in the Ulaby book regarding reflection.
Attached is a scanned of the page in question. This is regarding to Perpendicularly polarized plane wave. in equation (9.47a) at the lower left corner it is the distance ##x_i## to the origin....
View ArticleDoes electromagnetic waves are generated by dc current?
I am beginner in physics.I have question that when dc current flow they flow with apparent drift velocity so it appears that it should not emit em waves.But in actual current flow electrons are...
View ArticleLagrangian of object with air resistance
So I was going through an ODEs textbook and in a section discussing physical problems, decided that it would be interesting to come up with the equations of motion using Lagrangian mechanics for the...
View ArticleMagnetic field lines through copper
Hello. Assume an electron gun, as in CRT, made of plumbing copper instead of glass. Using magnetic scanning coils to move electron beam. Will the displacements of this beam be linear as if tube...
View ArticleHot gas expansion rate into outer space
Good Morning Sirs, it seems to be surprisingly hard to get the numbers of a mystery: How fast expand hot rocket exhaust gases into empty space? Of course aside from its exit velocity! Does the...
View ArticleClik here to view.
siphon and bernouli theorum
1. I found this diagram on book but there weren't any description.can someone tell me, what its trying to tell specially by those two red lines meeting the ground at the same place...? 2.this is a...
View ArticleNoise dependence
Hello :) i'm new to this forum, so excuse me for my straightforwardness ;) I'm working on my bachelor work and i can't find a solution. I'm writing about wind turbines' created noise dependence on...
View ArticleGuass's Law for a charge distribution
First, this is not a homework question, just something I've been confused about for some time. I understand how to use Guass's law in many ways but one thing I have always stumbled with is whether the...
View ArticleThe idea behind a reverse shock
So in a supernova explosion for example (5th slide) http://www.astro.princeton.edu/~burr...vesChisari.pdf Ambient medium is accelerated, compressed and heated. It pushes back into the ejecta, creating...
View ArticleEquating differentials => equating coefficients
Hi all, In thermodynamics one often has equations like A dx + B dy = ∂f/∂x dx + ∂f/∂y dy From which follows A = ∂f/∂x B = ∂f/∂y Can anyone explain to me why this conclusion is necessary from a...
View ArticleSynchrotron, question about insertion devices and electron velocity
When an electron enters an insertion device (wiggler and undulator) from the storage ring in a synchrotron the tangential velocity is equal to the velocity of the electron from the ring, is this correct?
View Article