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)` isA. `(pi)/(2)`B. `(pi)/(4)`C. `(pi)/(6)`D. `(pi)/(8)`

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)` isA. `(pi)/(2)`B. `(pi)/(4)`C. `(pi)/(6)`D. `(pi)/(8)`
Answer» Correct Answer - A 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)`.

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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)` isA. `(pi)/(2)`B. `(pi)/(4)`C. `(pi)/(6)`D. `(pi)/(8)`

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