A hydroelectric power facility converts the gravitational potential energy of water behind a dam to electric energy. (For each answer, enter a number.) (a) What is the gravitational potential energy (in J) relative to the generators of a lake of volume 38.0 km3 (mass = 3.80 X 1013 kg), given that the lake has an average height of 36.0 m above the generators? :l1 (b) Compare this with the energy stored in a 9-megaton fusion bomb. Ela ke/Ebomb =