[填空题]
(a) A grinding wheel 0.35 m i wpg j29yo7txft-;d q ..god,tn diameter rotates at 25kmzx8 7p z/u8f)g )yyk00 rpm. Calculate its angular velocity i kpz8)umxkf8z/) 7gyyn $rad/s$ $\omega$ = $rad/sec$ (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$