[填空题]
A 70-cm-diameter wheel accelerates uniformly about its center w1xn,bldm cad6y nm-v3.m l/1fromr / :n8szxmgoft)w)q2hi pzh s.gc832 130 rpm to 280 rpm in 4.i g):/cxzr8.z hs p no8g)mshq32wt2f0 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. $a_R$ $m/s^2$ $a_{tan}$ $m/s^2$