[填空题]
A 70-cm-diameter wheel ;qrp gkp; z9)jyvec4:j1(xqf3gd 1e4l/ schm uc:v4 qaccelerates uniformly about its center from 130 rpm to 280 rpm in 4.0 s. Determiu/ cq(4 31cehfjdg41s:mx vlqne
(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. $a_R$ $m/s^2$ $a_{tan}$ $m/s^2$
