Recent content by Mppl

oh thanks man, all I could think about was to divide both sides by x. Thats so simple... Thank you very much

how can I know that zero is the solution of x3^(2x+1)=9x I mean I know that it is the solution cause if I substitute zero I'll get an equality but how can I find it?

I know the power delivered by a generator is IV and I'm ok with that. I'm just curious, why doesn't it include a term involving a magnetic potential? I mean when the generator moves a charge it does some work per unit charge (V) because it applies a force storing energy in the electric field...

Homework Statement we have a metalic bar with thermal condutivity of 200w/(m*k) it has an area of 20 cm^2 which is in contact with with an heater that delivers 200 W and is at 300ºC. the metalic bar has a thickness of 1cm The two questions are: a) once the system have entered a...

well but I'm not being able to prove it either for dependent or independent variables, can you please show me the proof or tell me where I can find it? thank you

well I obviously know that the integral of the sum is the sum of the integral but I don't know how I can relate that to the situation a mentioned, can you please be more specific? I'm trying to prove it and I'm getting a convultion integral so far... thank you.

How do I prove that the mean of a random variable Z which is the sum of to other random variables X and Y is the sum of the mean of X with the mean of Y?

Well but that doesn't tell me much about the wave... Then the reflected wave just has to let the total field be zero at the interface and it has to satisfy the wave equation... And it let's me with a lot of possibilities...so I don't really know how the reflected wave is right? I just know it...

Well what I mean is for example if the reflected wave was Er=-Eo cos(wt)*e^23x which is indeed diffrent from a plane wave the continuity condition would still be valid so why not saying that that one is the reflected wave, I mean in what should I base the assumption that the reflected wave is...

I am having a problem understanding a thing in a electrodynamics problem. Imagine we have a wall at x=0 made of a perfect conducting material. Imagine now we have an electromagnetic wave traveling perpendicular to the wall with the electric field polarized in the y direction and the magnetic...