[填空题]
(a) What is the angular momentum of a 2.8-kg uniform cyl.dp0rjat c4b* indrical grink7okxn x 8ywzlollcpup: )q3s bbdb*;,y56:;ding wheel of radius 18 cm when rotatingnus;q :yc7zlbb; )xplo p bw l3*yx o,5:dk86k at 1500 rpm? $kg \cdot m^2$ (b) How much torque is required to stop it in 6.0 s? $m \cdot N$