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A popular ride at an amusement park involves standing in a cylindrical room. The room rotates and the wall presses against the rider as the floor drops down until the rider is no longer touching it. Annabel has a mass of 55.0 kg and the coefficient of static friction between the wall and her is 0.450. What is the minimum normal force exerted on her from the wall that will keep Annabel from sliding down?

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