This graph shows how the potential energy of a reaction system changes over time. Which statement is true for this system?

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.

The total amount of energy contained in an object

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?