SA PROBLEM 16.18 A prototype rotating bicycle rack is designed to save space train station. The combined weight of platform BD and the bicycle is 40 lbs and is centered at 1 ft. above the midpoint of the platform. The motor at A causes the support beam AB to have an angular velocity of 10 rpm and zero angular acceleration at 0= 60°. At this instant, determine the vertical components of the forces exerted on platform BD by the pins at B and D.

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.