An airplane is flying in a horizontal circle at a speed of 58.9 m/s. The 115 kg pilot does not want his radial acceleration to exceed 8.61 g. The acceleration of gravity is 9.8 m/s 2 . At this radius, what is the net centripetal force exerted on the pilot by the seat belts, the friction between him and the seat, and so forth? Answer in units of N.