A1*10^ 16 meter length of copper wire is at 20°C. The cross sectional area of the wire is 3.1*10^ -6 m^ 2 . Calculate the resistance of the wire *

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.