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In a skating stunt known as "crack-the-whip," a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 69.0 kg and is 5.50 m from the pivot. He is skating at a speed of 6.10 m/s. Determine the magnitude of the centripetal force that acts on him.

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