Q1. Two pulleys are fastened together to form an integral "composite pulley" (a single rigid body). The total mass m and the radius of gyration ko of this composite pulley are shown on the figure. At a certain instant, the indicated belt tensions act on the composite pulley and the composite pulley is turning counterclockwise. a) Draw a FBD of the composite pulley. b) Determine the angular acceleration of the unit for this instant if the moment due to friction in the bearing at O is 2.5 N.m clockwise. 1400 N |m = 25 kg ko = 250 mm 1150 N 500 mm 650 N 300 mm 45° 475 N

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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.