[填空题]
(a) What is the angulqa/xrxoiht- , *5)cgkju conm065jsko*1 bb/ ar momentum of a 2.8-kg uniform cylindrical grinding wheel of radius 18 cm when rotating ao1sc j *nm6/5 kbuj0bot 1500 rpm? $kg \cdot m^2$ (b) How much torque is required to stop it in 6.0 s? $m \cdot N$