[填空题]
(a) A grinding wheel 0.3iolt9g 4h),q1*pr o0kqtg8x v 5 m in diameter rotates at 2500 rp 3 g9o9(lspfoym. Calculate its angular veloci9opl3( 9fgoys ty 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$