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7.9 A 380-N child is in a swing that is attached to a pair of ropes...

7.9

A 380-N child is in a swing that is attached to a pair of ropes 2.10 m long. Find the gravitational potential energy of the child–Earth system relative to the child's lowest position at the following times.

(a) when the ropes are horizontal
J

(b) when the ropes make a 28.0° angle with the vertical
J

(c) when the child is at the bottom of the circular arc
J

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