[填空题]
(a) A grinding wheel 0.35lauqc 4 1f6o8u m in diameter rotates;6j/oslvt9 c b at 2500 rpm. Calculate its angular velocity cos9/tvj6l; b 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$