[填空题]
(a) A grinding wheel 0.35 m in diametls4. pko ,ezd1er r(trb- ab, h:xnotates at 2500 rpm. Calculate its angular velocity i:b, atrx-h(bnn $rad/s$ $\omega$ = $rad/sec$ (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$