a 23.0 kg child is riding a playground merry-go-round that is rotating at 40.0 rev/min. what centripetal force (in n) must she exert to stay on if she is 1.00 m from its center? (enter a number.) n(b) what centripetal force (in n) does she need to stay on an amusement park merry-go-round that rotates at 3.00 rev/min if she is 5.00 m from its center? (enter a number.) n(c) compare each force with her weight.