[填空题]
A 70-cm-diameter wheel accelerates uniformly about its center from 130 rpm 3lx)z*v 4zojs/ u1vesto 283uo/ s)zv*j vsz1exl4z.ll gjcs b7(10 rplj.1zsb 7gc l(m in 4.0 s. Determine (a) its angular acceleration,$\approx$ $rad/s^2$(Round to one decimal places) (b) the radial and tangential components of the linear acceleration of a point on the edge of the wheel 2.0 s after it has started accelerating. $a_R$ $m/s^2$ $a_{tan}$ $m/s^2$