[填空题]
(a) A grinding wheel 0.35 m in diameter rotatez2mqcp+:l 8oh s at 2501nhgivx wh 1(70 rpm. Calculate its angular velocithw7vi(h1g1n x y 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$