[填空题]
A cooling fan is turned off sj9k zc/pq(+r ad+ c1swpg6gaov e.6ul nlw7 ).hen it is running at 850rev/min It turns 1500 revolutions before it com ) waolg7.nu6g6 lpe.ves 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