Two speakers A and B emit sound waves that have the same wavelength and that are in phase. Point P is 9.0 m from speaker A and 5.0 m from speaker B. What is the longest wavelength of the sound emitted by the speakers for which the interference at P will be destructive

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.

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

Newtons view of arrangement of the universe. don't copy from anywhere.