[填空题]
(a) A grinding wheel 0.35 mr+rfwp1l a 1g6 in diameter rotates at 250dh7ow 9 .tod,q0 rpm. Calculate its angular velocity ,w.hodtd9oq 7in $rad/s$ $\omega$ = $rad/sec$ (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$