[填空题]
A cooling fan is turned off when it is running at d h7dmsiyf20r1lk, 4:nfxoy /850rev/min It turns 1500 revoy3 ov:w5, g-pswx pi5h5hybhu ;g3 sa+lutions befo5 hh g,suiy3h ba 5;:xysw5wpop-gv+3re 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