Part A

The rod $OA$ rotates clockwise with a constant angular velocity of $6ra\frac{d}{s}.$ Two pin$-$connected slider blocks, located at $B,$ move freely on $OA$ and the curved rod whose shape is a limacon described by the equation $r=200(2-cos)mm.($Figure $1)$

Determine the magnitude of the acceleration of the slider blocks at the instant $=130.$

Express your answer to three significant figures and include the appropriate units.