power (kW) 8800 8000 7000 6000 5000 4000 3000 2000 1000 0 1 2 A wind farm with 11 turbines, each with a diameter of 162 m, is located in the north- eastern part of Aberdeen. The following graph shows the wind speed at the wind farm for each hour of the day. Wind speed (m/s) 13 12 3 11 10 9 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Hours Electricity will only be generated by the wind turbines when the wind speed is above 9.5 m/s. The air density is 1.24 kg/m and the wind turbine has an efficiency of 30%. a) How much energy would the wind farm generate and transmit to the grid in one day? 4 5 6 7 8 9 10 11 power (kW) 12 13 14 Wind speed (ms) 15 16 17 18 19 20 21 22 23 24 25