[填空题]
(a) A grinding wheel 0.35 mwmpz2 kq1muy11io9e 4 3u;jro in diameter rotates at -,ny 7 tqoks;n2500 rpm. Calculate its angular velocity i-7o q;,s nkyntn $rad/s$ $\omega$ = $rad/sec$ (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$