A wheel is rotating at 900 rpm about its axis. When power is cut off it comes to rest in 1 min. The angular retardation in rad s^(-2) is

A wheel is rotating at 900 rpm about its axis. When power is cut off i

1.	A wheel is rotating at 900 rpm about its axis. When power is cut off it comes to rest in 1 min. The angular retardation in rad s^(-2) is
Answer» `(pi)/(2)` `(pi)/(4)` `(pi)/(6)` `(pi)/(8)` SOLUTION :ANGULAR velocity, `omega_(0)=(900xx2pi)/(60)"rad s"^(-1)=30 pi "rad s"^(-1)` Now, `0=omega_(0)-alphat` or Angular retardation, `alpha=(omega_(0))/(t)=(30pi)/(60)"rad s"^(-2) =(pi)/(2) "rad s"^(-2)`.