[填空题]
A cooling fan is turned off whe /sxz:,q,2 vx yj)uly2niy6epn it is running at 850rev/min It turns 1u 6n11.fyty-, e(zqj wbdq5 mf500 revolutfnw- 1mj,(6u.ye qby5fdz q1tions before it comes to a stop. (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