[填空题]
(a) A grinding wheel j ltovl0sy4 zz /;:;n yrx-e4g0.35 m in diyk+f-7b hfh tosyks2wjpz(gi *z- +63ameter rotates at 2500 rpm. Calculate its angular hb ts+jyh f s6 p7-z+2-k*zg o3(kyiwfvelocity 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$