A 250-N child is in a swing that is attached to a pair of ropes 1.80 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 448.6 J (b) when the ropes make a 25.0° angle with the vertical 43.2 X Check your work to see if using an angle of 90° would give you the same result as in part (a). J (c) when the child is at the bottom of the circular arc 0 J

Principles of Physics: A Calculus-Based Text
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Chapter6: Energy Of A System
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A 250-N child is in a swing that is attached to a pair of ropes 1.80 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
448.6
(b) when the ropes make a 25.0° angle with the vertical
43.2
X
Check your work to see if using an angle of 90° would give you the same result as in part (a). J
(c) when the child is at the bottom of the circular arc
0
J
Transcribed Image Text:A 250-N child is in a swing that is attached to a pair of ropes 1.80 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 448.6 (b) when the ropes make a 25.0° angle with the vertical 43.2 X Check your work to see if using an angle of 90° would give you the same result as in part (a). J (c) when the child is at the bottom of the circular arc 0 J
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