[填空题]
A cooling fan is turned off when it is running at 850rev/min It turns 150)lwkdyr t2wqw348 b -r0 revx jgndwdr )5(u;kh*+ug1j )icolutions5gwkhd*j+dxj;r )u gic( )un1 before 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