[填空题]
(a) A grinding wheel 8r9x-pt lvz(( du,ipdi2q3 d(ugy*jx 0.35 m in diameter regs k.(oe a5ad2vg7 2gotates at 2500 rpm. Calculate its angular velocity 2a s2gd(kg goev7ea.5in $rad/s$ $\omega$ = $rad/sec$ (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$