[填空题]
(a) A grinding wheel 0.(moc3 t 9xfvdxha8uun -+6 4ed35 m in diameterkyb (q u6co/j; rotates at 2500 rpm. Calculate its angular velocity i qboky(u ;6/cjn $rad/s$ $\omega$ = $rad/sec$ (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$