A ring of radius 0.5 m and mass 10 kg is rotating about its diameter with angular velocity of 20 rad s^(-1). Its kinetic energy is

A ring of radius 0.5 m and mass 10 kg is rotating about its diameter w

1.	A ring of radius 0.5 m and mass 10 kg is rotating about its diameter with angular velocity of 20 rad s^(-1). Its kinetic energy is
Answer» 10 J 100 J 500 J 250 J Solution :MOMENT of inertia of a ring about its diameter `I = (1)/(2)MR^(2)` and kinetic energy is GIVEN by `E_(k)=(1)/(2)I omega^(2)rArr E_(k)=(1)/(4)mr^(2)omega^(2)=(1)/(4)xx10xx(0.5)^(2)xx(20)^(2)=250 J`.