What causes the moon's phases? a. the rotation of the moon on its axis b. earth's tilt on its axis as it revolves around the sun c. changes in how much of the sunlit side of the moon faces earth. d. the position of the moon each month in relation to?

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.