Problem $16\mathrm{.}018-$ A prototype rotating bicycle rack

A prototype rotating bicycle rack is designed to save space at a train station. The combined weight of platform BD and the bicycle is $44$ lbs and is centered at $1$ ft above the midpoint of the platform.

Problem $16\mathrm{.}018.$b $-$ Force at pins

The motor at A causes the support beam $AB$ to have an angular velocity of $10$ rpm and zero angular acceleration at $=60.$ At this instant, determine the vertical components of the forces exerted on platform $BD$ by the pins at $B$ and $D.$

The vertical component of the force exerted by pin $B$ is

lb$.$

The vertical component of the force exerted by pin $D$ is

lb$.$