[填空题]
A cooling fan is turkq23:e m+ibgl ned -* exky2vgbv) off when it is running at 850rev/min It turns 1500 revolutions before it comes to a stopgvy)vb * xk2-e. (a) What was the fan’s angular acceleration, assumed constant? $\frac{rad}{s^2}$ (b) How long did it take the fan to come to a complete stop? s