The record number of boat lifts, including the boat and its tencrew members was

Question

The record number of boat lifts, including the boat and its tencrew members was achieved by Sami Heinonen and JuhaRäsänen of Sweden in 2000. They lifted a total mass of653.2 kg approximately 4 in. off the ground a total of 24 times.Estimate the total mechanical work done by the two men in liftingthe boat 24 times, assuming they applied the same force to the boatduring each lift. (Neglect any work they may have done allowing theboat to drop back to the ground.)
1 J

Explanation / Answer

Work = Force x Distance W = mgd m = 653.2 kg d = 4 in. = 0.1016 meters g = 9.8 m/s² W = (653.2 kg) (0.1016 meters) (9.8 m/s²)  =   650.37 Joules   ------> work required tolift the boat once. The net work is 0 because the boat ends up back on the ground,however the total mechanical work is: 24 x 650.37 Joules = 15609 Joules

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