True or false: even though ozone protects us when we are breathing it near the ground, it is harmful to us when it is high up in the atmosphere.

Avalue that describes how heavy an object is and is related to the force of gravity is

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 causes the formation of ocean currents?