[填空题]
(a) A grinding wheel 0.35 m in dimg ovy4r ;+9zjameter ro+noc2zzj))*hu p zp6qtates at 2500 rpm. Calculate its angular velocity ij ocnzqpz)uzp6* h)2+ n $rad/s$ $\omega$ = $rad/sec$ (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$