What is the wavelength of an earthquake wave if it has a speed of 15 km/s and a frequency of 9 hz?

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 properties of a moving object are used in determining the object's energy of motion

If element x has 99 protons how many electrons does it have