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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

  • physics -

    (a) M*g*R
    (b) M*g*R (1 - cos 29)
    (c) zero

    In this case, M g = 120 N

  • physics -

    (a) 264
    (b) 461.49
    (c) 0

  • physics -

    (a) =F*h
    120*2.2= 264
    (b)264*(1-cos29)
    =33.1
    (c)zero

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