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Water flows over a dam at a rate of 800kg/s and falls vertically 102m before striking the turbine blades. Calculate the speed of the water

Water flows over a dam at a rate of 800kg/s and falls vertically 102m before striking the turbine blades. Calculate the speed of the water right before hitting the turbine blades and the mechanical power (the power you know!) produced by the falling water assuming that the transfer efficiency from gravitational potential energy to mechanical energy is 63%.

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