[填空题]
(a) A grinding wheel eii60 ; 5hfjcn0.35 rahm4ef a,jy(35n8 yh m in diameter rotates at 2500 rpm. Calculate its angular veloc4mhaf,(3njeyar 5y8 hity 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$