Bar $BC$ rotates about the fixed pivot $B$ with constant angular velocity $=3ra\frac{d}{s}.$ Pin $A$ is fixed to bar $OA,$ which rotates about a fixed axis through point $O,$ and is engaged in the slot of member $BC.$ If at the instant presented, $=35,$ calculate the angular velocity and angular acceleration of bar $OA$ for this instant. Use $d=0\mathrm{.}3m$ and CCW$)$