A coin falls off a table and is traveling to the ground. Which claim about the forces acting on the coin must be true?

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

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.

What are some properties of transverse waves?