[填空题]
(a) A grinding wheel 0.i2s vvtr. lw,.35 epydx 9yhm 8(6m in diameter rotates at 2500 rpm. Calculate its angulardmh( 6x ypy98e velocity 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$