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16. A hydroelectric power facility converts the gravitational potential
energy of water behind a dam to electric energy.
(a) What is the gravitational potential energy relative to the generators of
a lake of volume 50.0 km^3 ( mass = 5. 00×10^13 kg ), given that the lake
has an average height of 40.0 m above the generators?
(b) Compare this with the energy stored in a 9-megaton fusion bomb.

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