[填空题]
A cooling fan is turned off when it is runn cl4w xc*0gi4ddv 34tqing at 850rev/min It turns 1500 revo;g lchm8/p ps)lutions before it comes to a lmp /h8pcg;s)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