Question

A flywheel of mass 60 kg and radius 4o cm is revolving at 300rpm ,its kinetic energy is

Answer 1

Rotational energy or angular kinetic energy is kinetic energy due to rotation of the object and is part of its total kinetic energy.

Angular Kinetic Energy, K.E. = $\frac{1}{2} I \omega^{2}$

where I is Moment of Inertia ; $I = mr^2$

ω is angular velocity

m is mass

r is radius

So,$K.E._{rotational} =\frac{1}{2} *60 * 40^{2} * 300^{2} =432 *10^{7}$