[填空题]
(a) What is the angular momentum of a bo7 1xyd omy5mq*3yo n3yk6-bz)l, uk2.8qms*5 :ho nvesh:(px /-kg uniform cylindrical grinding wheel of radius 18 cm whe:o:(m ep *sxv/hqhs5 nn rotating at 1500 rpm? $kg \cdot m^2$ (b) How much torque is required to stop it in 6.0 s? $m \cdot N$