A hydroelectric power facility converts the gravitational potential energy of water behind a clam to electric energy. (For each answer, enter a number.) (a) What is the gravitational potential energyr (in J) relative to the generators of a lake of volume 67.0 l-(m3 (mass = 6.7-0 x 10 13 kg], given that the lake has an average height of 43.0 m above the generators? |:|J (b) Compare this with the energy stored in a 9-megaton fusion bomb. ElakefEbomb = |:|