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 the farthest out has a mass of 80.0 kg and is 6.10 m from the pivot. She is skating at a speed of 6.80 m/s. Determine the magnitude of the centripetal force that acts on her.