A 53.0 kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 21.0 m. (a) What is the centripetal acceleration of the child? 1.85  m/s2         (b) What force (magnitude and direction) does the seat exert on the child at the lowest point of the ride? magnitude    617.45   N direction 0  ° (from upward) (c) What force does the seat exert on the child at the highest point of the ride? magnitude   412.35 N direction  0 ° (from upward) (d) What force does the seat exert on the child when the child is halfway between the top and bottom? magnitude _______ N direction _________° (from upward)

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!