Recent content by najima

My English is poor, In the question just drew as I have shown, and I think the shape of it isn't important. Maybe I must pay attention to normal force.

Sorry its my fault, We just hit the ball in the same way

No, it didnt mention for second figure could you help me? (the figure: on the way there is a hole and another one there isn't)

Am I right?

if we have friction we have rotational and translational motin. so for the ball Ei=0 Ef=1/2 Iω^2+mgLcosα+1/2 mv^2 where I=2/5MR^2

No but I think because of frictional force the ball is rolling, if the plane is frictionless both of them get the same time

no, Ei=0 Ef=1/2 Iω^2+mgLcosα if α is the angle , L is distance

[b]1. Homework Statement [/b I have 2 question Homework Equations which one gets to point o earlier?we release them,both of them have the same conditions. the distance and mass every thing are the same. I have attached the figuresThe Attempt at a Solution I think in the first one because of the...

thanx any way :-)

I've seen Boltzmann factor, but I don't know how I can proove it,could u tell me some hints?

for obtaining Planck distribution first we use this equation N_(n+1)/N_(n)=exp(-hω/2π(kT)) and then the fraction of total number of oscilators in nth quantum stae is N_n/∑_(s=0)^∞▒ N_s =exp(-hω/2π(kT))/∑_(s=0)^∞▒〖exp(-shω/2π(kT))〗 <n>=∑_(s=0)^∞▒〖s...

Homework Statement I can't find the proof of "the ratio of the number of oscillators in their (n+1) )th quantum state of excitation to the number in nth quantum state is: k is boltzman costant N_(n+1)/N_(n)=exp(-hω/2π(kT)" Homework Equations The Attempt at a Solution:-( I don't have any idea

now I try it again ,by using your suggestion.this is my homework for tomorrow.:(

thanks a lot turin and buffordboy for your helping,it helps me,

probability of particle existence .