The angular speed of a flywheel making $120$ revolutions per minute is:

In uniform circular motion,the velocity vector and acceleration vector are

$A$ particle is performing $U.C.M.$ along the circumference of a circle of diameter $50 \ cm$ with a frequency of $2 \ Hz$. The acceleration of the particle in $m/s^2$ is:

$A$ particle is moving along a circular path with constant speed and centripetal acceleration '$a$'. If the speed is doubled,the ratio of its acceleration after and before the change is:

$A$ particle revolves around a circular path. The acceleration of the particle is