[填空题]
A cooling fan is turned od.7dp0 e6pviw6 b 2hzgdu 5wq:ff wy31 3kzz lw (;h/ ypc8 z0gd:ptsuq,omhen it is running at 850rev/min It turns 1500 revolutions before it comes to a stop.ymp1zzq/08:z( w3tug;s,oc 3kd p lyh (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