Recent content by Zamze

Thank you

Hi! Id like to point out that I am the guy that made the post, accidentally logged in with the wrong account. So the exact question is How do we know that a vector is invariant to changes of coordinate system if we only have the components of the vector and not the basis vectors?

Ty very much.

Homework Statement This question comes from calculating the Einstein A and B coefficients. I am supposed to find the average value of cos(x)^2 over the solid angle of a sphere which is 1/3. And I need to show this. A similar course in a different uni just says that For...

Homework Statement 8. A house is cooled by an air conditioner. The outside temperature is 32°C and the inside temperature is 21°C. The heat leakage into the house is 9000 kcal/hr. If the air conditioner has the efficiency of a Carnot engine, what is the mechanical power required to keep the...

thx a lot for the help, managed to solve it now =). cheers!

I haven't learned Gauss law yet. but what it comes down to i guess is E=F/Q and E=U/d where E is the electric field strenght, F is the force and can be mg, Q is the charge of the ball. U is the voltage between the fields, and d is the distance between the fields. ive tried with F/Q=u/d but...

Youre right that was for point charge and not for parallel plates. that makes it harder for me since i can't calculate out the electric field strenght now.

i found out that E=(mg)/Q but this still didnt help me. (E here is for electric field strenghts) so i tried k which is 8.99*10^9. (k*Q)/r^2 and got 43142 N/C for E. then my E*d = 2157 volt, so then i involved E=(mg)/Q (E*Q)/9.82 and got m = 5.25*10^-5. and since delta m is 0.25g i did my m...

Homework Statement a positivly spheric charged ball is placed on an isolating tripod. its going to be used to measure the voltage between 2 parallel metaldiscs. trough a tiny hole in the lower metaldisc the ball reaches into the homogen field. the ball and the isolated tripod are on top of a...