[填空题]
(a) A grinding wheel 0.358 4q2yzdx wbg4 y3.kiuc4c1bt m in diameter rotla am -bni9-1hates at 2500 rpm. Calculate its angular vean-i hl 1b9ma-locity 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$