[填空题]
(a) A grinding wheel 0.35 m in diameter rotatkwzw.if p;bc. jn6p2qhw o.s9w2 r;.u2lv 8; .u9q+kfz twyxkes at 2500 rpm. Calculate its angular veloc;tw.2lxyzf 9u +k8qvk ity 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$