The following measurements were made at a potential site for a wind farm: The turbines have blade length of 20 m, overall efficiency is 0.3 (constant for all wind speed), the density of air is 1 kg/m3. a) A wind turbine has a cut-in speed at 3 m/s and a cut-out speed at 7 m/s. Find the average speed which the turbine operates at and the average power produced by the turbine. 1 Speed (m/s) hours 0 2 4 6 8 10 100 300 100 200 200 100 b) The cut-out speed of the turbine is improved to 9 m/s. Find the new average speed and the average power produced.