3. A jet aircraft is moving at a constant speed of 500 kilometers per hour. How long does it take the jet to
travel 2,000kilometers?

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.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

Which sound characteristic is not affected by the relative motion of an object