[填空题]
(a) A grinding wheel 0.35 m in diame*l5nslwif(. i s .bzy1ter rotates jfr 9 rw/ac;jozsorn1 a8v ;k(72;pgtat 2500 rpm. Calculate its angulars fn;1; t(rp j7wkg29avo 8r;oc/ rzja 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$