[填空题]
(a) A grinding wheel 0.35 m in diameter rotatesr ,omgvb0tf1 2 at 2500 rpm. vs.98cjjey toovp8f;/k/x ( cCalculate its angular velocity / sjco8fyo8c9t; vvpxke/. (j 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$