Question

A child with a weight of 200 N swings on a playground swing attached to 2.00-m-long chains. What is the gravitational potential energy of the child- Earth system relative to the child's lowest position at the following times? (a) when the chains are horizontal j (b) when the chains make an angle of 30.0° with respect to the vertical J (c) when the child is at his lowest position

Answer 1

A (a) potential energy at point A is PE migh = PE = 0 pro x 2 J PE = 400 J PE at B 30 L PE - ngx z cos30° X PE = mg L (1-60530) z oo x 2 (2-2) 8 PE 53,5898 J when child i, at lowest position PE at C L PE = mg xo PE E OJ