envscigrl
Oct27-04, 10:45 PM
Here is my last problem I am having problems with:
A solid ball of mass 1.70kg and diameter 16.0cm is rotating about its diameter at 65.0rev/min. What is its kinetic energy ?
Ok so KE for rotation is : 1/2*I *w^2
so I found I with m *r2
and then plugged everthing into the Ke equation but didnt get it right. I converted everything and divided the diameter by 2. What could I be doing wrong??
A solid ball of mass 1.70kg and diameter 16.0cm is rotating about its diameter at 65.0rev/min. What is its kinetic energy ?
Ok so KE for rotation is : 1/2*I *w^2
so I found I with m *r2
and then plugged everthing into the Ke equation but didnt get it right. I converted everything and divided the diameter by 2. What could I be doing wrong??