A pendulum bob with a mass of 0.44 kg is attached to a 1.5 m long string as shown, As the pendulum bob swings from point A, where the angle 0 = 33, to point B at the bottom of its arc, determine the change in the gravitational potential energy of the pendulum bob-earth system, :1 Supporting Materials 7' Physical Constants Submit Answer /3 Points] OSCOLPHYS1 7.P.025,WA. A child with a weight of 170 N swings on a playground swing attached to 1.90 m long chains. What is the gravitational potential energy (in J) 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 28.0 with respect to the vertical J (c) when the child is at his lowest position J