Mathematics, 14.09.2019 02:30, kekeke68

the hoover dam in the u. s produces 2 x 10 ^9 watts of electricity and is composed of 7 x 10^9 kg of concrete. concrete requires 1mj of energy to produce 1 kg
1) how much energy did it take to produce the dam?
2) how long is the "energy payback time" for the dam?
show your work.

Answers: 2

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the hoover dam in the u. s produces 2 x 10 ^9 watts of electricity and is composed of 7 x 10^9 kg of...