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OpenStudy (anonymous):
A dam produces 250W/m^2 of electricity. It composed of 7x10^9kg of concrete. Concrete requires 1MJ of energy to produce per kg. How much energy did it take to produce the dam? How long is the 'energy payback time" for the dam?
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OpenStudy (anonymous):
With those units, we need some sort of m^2 dimension to determine the power output of the dam.
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