A circular disc of radius r and mass m rotates about the axis passing through the centre and perpendicular to its plane. What will if rotational kinetic energy?

A circular disc of radius r and mass m rotates about the axis passing

1.	A circular disc of radius r and mass m rotates about the axis passing through the centre and perpendicular to its plane. What will if rotational kinetic energy?
Answer» `(1)/(4)mromega^(2)` `(1)/(2)mromega^(2)` `(1)/(4)mr^(2)omega^(2)` `(1)/(2)mr^(2)omega^(2)` Solution :Rotational kinetic ENERGY = `(1)/(2)IOMEGA^(2)` `=(1)/(2)xx(mr^(2))/(2)xxomega^(2)` `=(1)/(4)mr^(2)omega^(2)`