Easy physics practice question

[gamer1319]

Homework Statement

an electron (mass 9.11*10^-31kg) moves in a circular orbit around nucleus of mass 1.67*10^-27kg. if the radius of orbit is 5*10^-11 meters and the angular momentum is 1.05*10^-34 kg*m^2/s

find moment of inertia
angular speed
angular kinetic energy

Homework Equations

The Attempt at a Solution

to find I, we need W (angular velocity). How do i find this if i just have 2 masses and radius?

 

[cupid.callin]

well can you find speed of electron?

 

[gneill]

to find I, we need W (angular velocity). How do i find this if i just have 2 masses and radius?

What's the moment of inertia of a point mass at a distance r from the center of rotation?