Calculate the moment of inertia of a fly wheel, if its angular velocity is increased from 60 r.p.m. to 180 r.p.m. when 100 J of work is done on it.

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)`