A spool slides down along a smooth rod, which has a angular rate of rotation theta…

A spool slides down along a smooth rod, which has a angular rate of rotation theta in the vertical plane. What is the radial component of the acceleration of the spool, a_r? a_r = g sin theta – r a_r = g sin theta a_r = g sin theta + r a_r = g cos theta a_r = g cos theta – r