[填空题]
(a) A grinding wheel 0.35 m in diae /4lb3,gsiz; 4 vuoezmeter rotates at 2500 rpmws b uwg4xd,.5.pxpri 4 41e:soex5dm. Calculate its angular velocity ir51s.b,we oemxi 4dd4x 5pxg . ws4up:n $rad/s$ $\omega$ = $rad/sec$ (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$