# Physic

A dam is used to block the passage of a river and to generate electricity. Approximately 58.4 x 103 kg of water falls each second through a height of 20.1 m. If one half of the gravitational potential energy of the water were converted to electrical energy, how much power (in MW) would be generated?

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1. power= PE rate*efficiency
= 58.4kg/s *9.8m/s^2*20.1m*1/2

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