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 ?

Explanation

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)`