15/25 A 2600 gram bird is moving at a speed of 25 m/s. How much kinetic energy does the
bird have?
32,500 J
650,000 J
65,000 J
812,500 J
Immunity

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.