A box of mass m - 2.50 kg is dropped from rest onto a massless, vertical spring with spring constant k = 2.20 x 102 N/m that is initially at its natural length. How far is the spring compressed by the box the initial height of the box is 2.25 m above the top of the spring?

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 kind of simple machine is a catapult?

Which composition of water moves to begin a deepwater current?