[填空题]
(a) A grinding wheel 0.30.jsfr;yngf3;jl zri5 r +np75 m in diamx )ydu.vm m3d53fx )hreter rotates at 2500 rpm. Calculate its angular h f dvx3)xr5)u mm3dy.velocity 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$