Recent content by Stef42

Bump as I would really be interested in some sort of answer to this question :) Basically, for a physicist with a Masters/Phd, what job paths are there excluding Finance and academia? Oh and where would be the best place to find that sort of information for the Uk/Europe? Cheers.

I was thinking that since the probability is 50/50, the number of girls would be 25, but this would mean the total birth rate was 50 in a day, making it much higher than the average. So since the prob of males is independent of the total born, surely the expected number of girls would be 15, as...

thanks for the tip :)

Homework Statement The av. birth rate in a hospital is 30 births per day. In a given day 25 boys are born. How many girls do you expect to be born on that day? (assume the prob. of being a boy is 1/2 and is independent of the total number of births) Homework Equations The...

well, at least I'm not the only one who gets confused, damn vector calculus :frown: well from my lectures notes: "The divergence represents the flux density of the vector field and, because of the derivative operation, has an associated Fundamental Theorem of Calculus called the divergence...

thanks for the speedy response tiny-tim :-) Ok so just to clear up: ∇.V= divergence of vector field V V.n= flux So then the sigma integral is flux density ? So what did I calculate? flux density aswell? wasn't I supposed to find the flux? :confused:

Homework Statement Use the divergence theorem in three dimensions \int\int\int\nabla\bullet V d\tau= \int \int V \bullet n d \sigma to evaluate the flux of the vector field V= (3x-2y)i + x4zj + (1-2z)k through the hemisphere bounded by the spherical surface x2+y2+z2=a2 (for z>0)...

Just like to say I finally got it :) I just used V=IZ really. Say that current I flows through the first filter and current I_{1} goes through the second one. Starting from the right, I_{1}=j\omega C\times V_{out} RI_{1}=j\omega CR V_{out} V_{1}=RI_{1}+V_{out}=(j\omega CR+1) V_{out}...

Homework Statement Given the coupled RC network shown below (see attachment), show that the voltage transfer function is \frac{Vout}{Vin}=\frac{1}{(1-\omega^2C^2R^2)+3j\omega CR} Hint: \frac{Vout}{Vin}=\frac{V1}{Vin}\frac{Vout}{V1} Homework Equations For Capacitor, Z=\frac{1}{j\omega C}...