The lift on a spinning circular cylinder, in a freestream with a velocity of 10m/s, is measured as L1 at standard sea level conditions and L2 at an altitude of 10,00ft. (Assume that both cases generate the same circulation around the cylinder.) How do you compare L1 and L2?

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.