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A piston head inside an engine is allowed to vertically free fall. The cylinder diameter is 0.5 in, and the piston head has a diameter of 0.45 in and a mass of 0.8 lbm. A thin layer of unused engine oil separates the head from the piston. Determine the percentage increase in the speed at which the head falls if the temperature of the oil increases from 75 °F to 200 oF. cylinder head engine oil