[填空题]
(a) A grinding wheel 0.35 m in dinxu;m *ccdx :1j8z tqhwi9c0oiz4,2gam0hdeb k9i(f k1eter rotates at 2500 rpm. Calculate its angular velocity in 9kb0h (eif1dk $rad/s$ $\omega$ = $rad/sec$ (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$