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October 23, 2014

Homework Help: physics

Posted by Katie on Monday, October 18, 2010 at 10:05pm.

A 120 N child is in a swing that is attached to ropes 2.20 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 29.0 angle with the vertical

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

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