[填空题]
A 70-cm-diameter wheel accelerates uniformly about its cenj3+ 4iz9byo2gnp/8s wqt 3khhter f+3)e twxdqq0o svy4f;rom 130 rpm to 280 rpm in 4.0 s.s wf;+qx qdvt304oe y) 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. $a_R$ $m/s^2$ $a_{tan}$ $m/s^2$