Question

When a compact disk with a 12.0-cm diameter is rotating at 4.2 rad/s, what is (a) the linear speed and (b) the centripetal acceleration of a point on its outer rim?

Answer 1

tangential linear speed= angular speed*radius=4.2 rad/s*12cm= ...

centripetal acceleration= v^2/radius= w^2*radius= 4.2^2 * 12cm/s^2