A 180-N child is in a swing that isattached to ropes 2.20 m long. Find thegravit

Question

A 180-N child is in a swing that isattached to ropes 2.20 m long. Find thegravitational potential energy associated with the child relativeto her lowest position at the following times. (a) when the ropes are horizontal
1 J

(b) when the ropes make a 34.0° angle with the vertical
2 J

(c) when the child is at the bottom of the circular arc
3 J
(a) when the ropes are horizontal
1 J

(b) when the ropes make a 34.0° angle with the vertical
2 J

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

Explanation / Answer

the gravitational potential energy is PE=m*g*h Part A) PE=m*g*h PE=180*2.2 PE=396 J Part B) PE=m*g*h PE=180*(2.2-2.2cos34) PE=67.7 J Part C) PE=m*g*h PE=180*0 PE=0 J

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