[填空题]
(a) A grinding wheel 0.+*bm- loup4 ji35c.yz(oj(5vyi m in diameter rotates at 2500 rpm. Calculate its angular velocityzy (oi5v(jyc . 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$