[填空题]
(a) What is the angular mom9lnyv()9bho1xgt 9 lc;l5 ypqentum of a 2*c1b n*,wd.leu;vwme jt8. . rlm g uv7.v5tim.8-kg uniform cylindrical grinding wheel of *.rjetuv5* iec.1ugww7;dm 8vn b.l, m lm.vtradius 18 cm when rotating at 1500 rpm? $kg \cdot m^2$ (b) How much torque is required to stop it in 6.0 s? $m \cdot N$