Consider a wind turbine subjected to 30 km/hr steady winds. if the turbine produces 480 kw of power and the velocity downstream of the wind turbine is 25 km/hr, determine the turbine efficiency, turbine diameter, and the horizontal force exerted by the wind on the supporting mast of the turbine. take density of air to be 1.25 kg/m^3

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.