Disk D rolls without slipping over the horizontal surface. At the instant shown, point A on bar OA, which is pinned to the fixed point at O at its left end, is moving straight down with constant speed vo. End B of bar AB is pinned to the disk at point B. At this instant, determine, as functions of R and vo, the angular velocities and angular accelerations of bar AB and disk D. R + 2R

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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.