PROBLEM 15.82 An overhead door is guided by wheels at A and B that roll ir horizontal and vertical tracks. Knowing that when 0 = 40° the velocity of wheel B is 0.5 m/s upward, determine (a) the angulai velocity of the door, (b) the velocity of end D of the door. 2 m

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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.