When 100 J of work is done on a fly wheel, its angular velocity is increased from 60 rpm to 180 rpm. What is the moment of inertia of the wheel ?

When 100 J of work is done on a fly wheel, its angular velocity is inc

1.	When 100 J of work is done on a fly wheel, its angular velocity is increased from 60 rpm to 180 rpm. What is the moment of inertia of the wheel ?
Answer» SOLUTION :Kinetic energy `E=(1)/(2)I(omega_(2)^(2)-omega_(1)^(2))` `100=(1)/(2)I(4PI^(2).9-4pi^(2).1^(2))` `I=0.633kgm^(2)`