[填空题]
(a) A grinding wheel 0.35 m i +bet;sdacb+y*smk.. n diameter rotate8 n0 *lagz k66wjm/xmks at 2500 rpm. Calculate its angular velo6l*/m6a gjm0wxz8 kk ncity in $rad/s$ $\omega$ = $rad/sec$ (b) What are the linear speed and acceleration of a point on the edge of the grinding wheel? v = $m/s$ $a_R$ = $ m/s^2$