A two-bladed high-speed turbine is installed at the city nowhere which elevation is 400 m above sea level. the turbine rotor diameter is 60 m and the hub height is 110 m. the wind speed from a 10 m station is 7 m/s the ambient temperature is 28c and the surrounding vegetation is med-shrubs. calculate: the specific wind power and the maximum extractable power from the wind. the actual producable power by the turbine and its rotational speed. the turbine torque and the gearbox step-up ratio if the required generator speed is 1400 rpm.