An airfoil of chord length 2m and span 15 m has an angle of attack as 6 0 .the airfoil is moving with a velocity of 80m/s in air whose density is 1.25kg/m3 . Find the weight of the airfoil and the power required to drive it .The values of co-efficient of drag and lift coresponding to angle of attack are given as 0.03 and 0.5 respectively