Can Radio Signals be Assembled From Incomplete Parts or Signatures?
Hi all! I have been goofing around with antennas and wi fi radio equipment. Now I have a million questions about radio waves. I was wondering if signals could be improved by interpolating them through...
View Articlequestion regarding generalized momentum Pk, and its independence from gen....
Hi Physicsforums I am re-learning classical mechanics and having a tough time dealing with a certain line from Thornton/Marion. On page 269 (5th ed), a little after introducing Hamiltonian dynamics and...
View ArticleCanonical Transformations
Hi, Im working through some chapters of Goldstein and I'm up to canonical transformations now. On page 370 it says that the variational principle for the hamiltonians K and H are both satisfied if H...
View ArticleHow do I measure/calculate the permeability constant of a plastic using a...
Hi, I am trying to figure out how to calculate the permeability constant of a lot of plastics by making solenoid (because that seemed to be the best method of doing so). I am currently using:...
View ArticleCan a magnet's magnetic field preform work on another magnet?
Hallo everyone, Can a magnet do work on another magnet? (I believe it can. Just wanted to make sure.) What formula's do you use to support you're answer? Finally, I know that magnetic field can not do...
View ArticleA thought on waveguides..(TEM mode)
I have been wondering about the physical reason why a TE wave that goes STRAIGHT through the waveguide(without any reflections) and would like some one to clarify the same OK..so if i consider a...
View ArticleA thought on waveguides..(TEM mode)
I have been wondering about the physical reason why a TE wave that goes STRAIGHT through the waveguide(without any reflections) can't propagate and would like some one to clarify the same OK..so if i...
View ArticleWhat is violated here
I am at the moment trying to do something different in the classical mathematical derivations of the equations for rotations and trying to find out why this would not yield a correct result. This time...
View Articlepoint charge configuration with zero potential energy
is it possible to construct a system with only finite number of point charges of arbitrary magnitude at finite distance from each other such that the total potential energy is zero everywhere? i doubt...
View ArticleTransformation of variables in definite integral limits
Hello, I am going through Whittaker's treatise on Classical Mechanics. In chapter 3 he derives the equation of motion for a simple pendulum, and I have a question about his method. Starting from the...
View ArticleElectrostatic Potential over all space
If I have a sphere with radius R which has a charge distribution given by [itex]\rho(r)=\frac{5Q}{\pi R^{5}}r(r-R)[/itex] and [itex]\rho = 0 [/itex] at r bigger or equal to R, how do I find the...
View ArticleFree fall of hatch with a frictional hinge
Hi people! I have a real life problem that i can't solve....Im trying to figure out the tangencial speed or angular velocity of a hatch at the moment it is about to close (initially it was closed). The...
View ArticleGeneral Theory of Capacitance
Hello, I came across this topic while reading Principles of Electrodynamics which can be read from this link starting at page 54. Looking at page 56, my question is how could there be induced charge on...
View ArticleConcept of Entropy. (Question)
I have a question about the increasing behavior of entropy. Suppose we heat a metal (Take for instance Fe) till it radiates energy and then put it in space (No medium). So the metal radiates energy in...
View ArticleBoundary condition for a charged surface
Hi, I am looking at a problem where I have two electrically conducting fluids where charge accrues on the interface, I know that one of the equations that I have to use comes straight from the usual...
View ArticlePhysis symbols / fonts
Can anyone give a pointer as to where I can download a font which has a good selection of physics symbols & fonts. Things like Planck's constant h bar & the like. I'm getting fed up of trawling...
View ArticleEsr/epr
Having recently been in a group perfoming an ESR experiment I'm still not sure of how it works. OK ESR relies on free radicals, unpaired electrons. Electrons split into alignment with field in one of 2...
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Energy conservation law violated(seems to be)!
the charge(say positive) in figure induces negative charge on the disc and positive on sphere, the net force on charge is attractive towards the disc and is a function of position, now if someone moves...
View ArticleTorque on a free body
Hi everyone, I have a very simple and classic question here. Suppose I have a 10cm,0.01kg ruler (uniform density) in space. And I apply a 1N force 2 cm from the left end of it. What happened at this...
View ArticleTorque and momentum.
Sorry the title should be : Impulse and Momentum 3000Solved Problems in Physics-Shaum's 9.6: A camper lets fall a heavy mallet of mass M from the height y upon the top of a tent stake of mass m and...
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