[填空题]
A cooling fan is turned off when it is running at 850rev/min It turns 1500 revo+0uv6 a,it1ilgh sbf4s2:ak8po,hye ;33wp/t6l -axqgg vwylutions before it comes tvt-pgxaw/ y633 g;ql wo 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