[填空题]
(a) A grinding wheelfp:y 0r,a5xj iit6q j7d 1muhw 419jk5rxzoq /0.35 m in diameter rotates at 2500 rpm. Calculate its angular velocity /hwou1d5 4rqj zkx19 min $rad/s$ $\omega$ = $rad/sec$ (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$