Question: How much total energy is stored in the lake in Problem 7.79? As in that problem, take the gravitational potential energy to be zero at

How much total energy is stored in the lake in Problem 7.79? As in that problem, take the gravitational potential energy to be zero at the base of the dam. Express your answer in joules and in kilowatt-hours. (Hint: Break the lake up into infinitesimal horizontal layers of thickness dy, and integrate to find the total potential energy.)

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