[填空题]
(a) A grinding wheel 0.35 mt+m9z /z dq9ot in diameter rotates at 2500 rpm. Calculo gf3vm ulo:;8ate its angular velocitu fmovl;3 :o8gy 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$