[填空题]
(a) What is the angular m97 *4nf4zwkxwqo s 9hxo+luu; omentum of a 2.8-kg uniform cylindrical3thvm/b)8rpbotf/)md wiv- tjv+( o9 grinding wheel of rat9 o +rb vdi- )vjhtf)( b/vm/3wop8tmdius 18 cm when rotating at 1500 rpm? $kg \cdot m^2$
(b) How much torque is required to stop it in 6.0 s? $m \cdot N$