[填空题]
(a) A grinding wheel 0.3hkmyx) h9hs ;2cw4i3p5 gm lwwl 6.c6zq, 3fsw8m in diameter rotates at 2500 rpm. Calculate its angular velocity in.lcgww3fsw 6m6 8q l,z $rad/s$ $\omega$ = $rad/sec$ (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$