[填空题]
(a) What is the angular momentu/urf8fvvg)1 .zlr8ss t8k2y dm oflc *lbxhq a)1crm2 0f, a 2.8-kg uniform cylindrical grinding wheel of radius 18 cm when rotating at 1500 rpm?b0 lahxfc*rc12m l)q, $kg \cdot m^2$ (b) How much torque is required to stop it in 6.0 s? $m \cdot N$