Recent content by Fys

I had a question about 2 cases we have a cilinder with 2 Ideal Gases. The volume, mass and the number of particles is given. So We call it V(1),M(1),N(1) for the first gas and V(2),M(2),N(2) for the second gas. The two gases are separated by a movable wall Now what is the Ratio V(1)/V(2)...

I want to calculate the integral of a sphere with radius a using double integrals I have z^2+y^2+x^2=a and I plug this in my equation and integrate in polar coördinates Now i have \int^{2\pi}_{0} \int ^{a}_{0} \sqrt{(a-r^{2})} rdrd\theta But why do I need to multiply my integral...

Estimate for this lin potential V(r)=T r the groun state please help

oke thanks :P

Yes thanks but how can i work this out?

\left[L_{x},L_{y}\right]=\left[yp_{z}-zp_{y},zp_{x}-xp_{z}\right] =\left[yp_{z},zp_{x}\right]-\left[zp_{y},zp_{x}\right]-\left[yp_{z},xp_{z}\right]+\left[zp_{y},xp_{z}\right] How next? My book is not of much help I Tried \left[A,BC\right]=\left[A,B\right]C+B\left[A,C\right] But...

Homework Statement 1.Show that PV^Y is a constant for adiabatic,quassistatic expansion of a photongas and determine Y 2. Show the same for full degenerate gas of fermions at T=0 Homework Equations The Attempt at a Solution Plz help thx

He Reid thanks but should it not be (2 pi h)^{-1/2}? Do you know where on the net I can find this formula Thanks for the help

I am studying Quantummechanics, but I don't see how Fourriertransforms in quantum mechanics work I want to know how I can Fourrier Transform the Hydr. ground state, so the transform of \phi\left(r\right)=\left(\frac{1}{\pi a_{0}^3}\right)^\frac{1}{2} e^\left-(\frac{r}{a_{0}}\right)...

I have a bit difficulties deriving the equation V in =Vout * R2/(R1+R2) Because I can't see a closed loop here Can someone help with this Thx

Does someone know a good book or site or something about opamp's Thx guys

Can someone explain me what a zener diode does? I don't know what the turn on and breakdown voltage mean, and what forward and reverse biased means. And what the difference between a zener and a normal diode is? Thx very much

I had a question I sometimes don't know If resistors are in serie or parallel Like in the image I posted is it right that 1 is parallel with 2, 2 is parallel with 3, 3 parallel with 4, 4 parallel with 5 and 5 par with 6? How can I make one resistor out of this 7 resistors, or from 1 till 6...

Can someone help me detemine The thevenin Voltage, the thevenin resistance and the Norton current of this circuit I can't solve it cause it has two current sources I have uploaded the picture Thank you