Recent content by Tyst

4rcos(theta) came from simplifying the expressions above it, it is the divergence. And thank you - you answered my question!

Phi is the azimuthal angle

Homework Statement Here is a link to the problem: http://www.brainmass.com/homework-help/physics/electromagnetic-theory/68800 The Attempt at a Solution To find the divergence 1/r^2*d(r)*(r^2*r^2*cos(theta)) +[1/r*sin(theta)]*d(theta)*(sin(theta)*r^2*cos(phi))...

I was reading a NY Times article on the lawsuit filed by Wagner and Sancho and amongst the usual doomsday predictions of black holes devouring the earth, strangelets turning the Earth to strange matter etc... It made the claim that What kinds of things are they referring to? I mean... i know...

Thank you everyone, helpful as can be :D

Thank you Russ, I have been looking into how a particular machine works, and been asked to compile my findings into a front end engineering design report. I was initially thinking that 'front end' was just a non-standard reporting style, but perhaps i was wrong. Could i be being asked to put...

Hi, I was wondering if anyone here knows (and could tell me) how to put together a front end engineering design. I've been asked to create one, have no idea what it is and so far google has been no help! Thanks

Homework Statement What is the minimum KE of an electron trappen in an infinite square well potential of width a = 0.2nm? Homework Equations The Attempt at a Solution General solution to the simple harmonic oscillator equation: Ψ(x) = Asin(kx)+Bcos(kx) Where the potential of the...

Well, I'm an idiot :P solved it now! Thanks!

Yes, thanks for showing me that - perhaps it's just the tiredness setting in, or perhaps I'm just completely dense! But i am still not able to work this out.

Homework Statement A tank contains 150L of water in which initially 30g or salt is dissolved. Brine runs in at a rate of 4 L/m and each litre contains 1.5g of dissolved salt. The mix in the tank is kept uniform. Brine runs out at 3L/m. What is that amount of salt in the tank at any time t...

Ha! So i did, thanks.

Homework Statement In a double-slit experiment, the slits are on the y-axis and the electrons are detected on a vertical screen. When only slit #1 is open, the amplitude of the wave which gets through is \psi(y,t) = A \exp^{-y^2} \exp^{-i((ky-\omega t)} when only slit #2 is open...

Thanks Dick :cool:

Thank you for the response .ultimate, i was wondering if you could tell me how you came to get those answers? Perhaps you could tell me what equations were used, or how you came to that conclusion? Thank you