What is the work done in increasing the angular frequency of a circular ring of mass 2kg and radius 25cm from 10 rpm to 20 rpm about ist axis ?

What is the work done in increasing the angular frequency of a circula

1.	What is the work done in increasing the angular frequency of a circular ring of mass 2kg and radius 25cm from 10 rpm to 20 rpm about ist axis ?
Answer» SOLUTION :Work done `=` INCREASE in ROTATIONAL kinetic ENERGY `=(1)/(2)I(omega_(f)^(2)-omega_(i)^(2))=(1)/(2)MR^(2)(omega_(f)^(2)-omega_(i)^(2))` `=(1)/(2)xx2xx(0.25)^(2)(((2pi)/(3))^(2)-((pi)/(3))^(2))=0.2058J`