440-N child is in a swing that is attached to a pair of ropes 1.90 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 (b) when the ropes make a 35.0° angle with the vertical (c) when the child is at the bottom of the circular arc

Principles of Physics: A Calculus-Based Text
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Chapter6: Energy Of A System
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A 440-N child is in a swing that is attached to a pair of ropes 1.90 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

(b) when the ropes make a 35.0° angle with the vertical

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