Abackyard swimming pool holds 165 cubic yards (yd3) of water. what is the weight of the water in pounds?

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 diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?