Some electric-power companies use water to store energy. Water is pumped by reverse turbine pumps from a

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Some electric-power companies use water to store energy. Water is pumped by reverse turbine pumps from a low to a high reservoir. To store the energy produced in 1.0hour by a 120-MW (120 x 106W) electric-power plant, how many cubic meters of water will have to be pumped from the lower to the upper reservoir? Assume the upper reservoir is 520 m above the lower and we can neglect the small change in depths within each. Water has a mass of 1000 kg for every 1.0m3.
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