Easy physics practice question!

  • Thread starter gamer1319
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  • #1
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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?
 

Answers and Replies

  • #2
1,137
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well can you find speed of electron?
 
  • #3
gneill
Mentor
20,922
2,866
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?
 

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