Question: A wind turbine with a 4 0 - m diameter rotor produces 2 8 7 - k W output in a 1 0 m s

A wind turbine with a 40-m diameter rotor produces 287-kW output in a 10ms wind.
(1) What is its efficiency?
(2) A wind farm has 100 such wind turnbines. If the turnbes are arranged by 4-rotor-diameter tower spacing along its rows, and with 7-diameter spacing between rows (4D 7D. What is the power output per unit of land area (kWm2)? Assume array efficiency is 80%.
A wind turbine with a 4 0 - m diameter rotor

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