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

physics - drwls, Monday, October 18, 2010 at 11:23pm
(a) M*g*R
(b) M*g*R (1 - cos 29)
(c) zero

In this case, M g = 120 N
physics - hannah, Monday, November 15, 2010 at 7:39pm
(a) 264
(b) 461.49
(c) 0

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