Problem：A hydroelectric facility extracts power from a reservoir at an elevation of 800 m
discharging into a tailrace at an elevation of 200 m. A penstock 1500 m long and 0.8 m in diameter connects the reservoir to the tailrace. Minor losses are K = 3 and C = 1500. Determine the power extracted by the turbine if the flow rate is 2 m3/s. If a Francis turbine is to be used, specify an appropriate speed.
I find a solution from Coursehero. My answer in V and Re is different from this answer, I don't know why it is. Could you help me with it?
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