[填空题]
(a) What is the angular;e7riee .7oj i momentum of a *- kh nhy/zih32.8-kg uniform cylindrical grinding wheel of radius 18 cm when rotating at 1500 ri*yk hh/h 3z-npm? $kg \cdot m^2$ (b) How much torque is required to stop it in 6.0 s? $m \cdot N$