It is common experience to hear the sound of a low-flying airplane and look at the wrong place in the sky to see the plane. Suppose that a plane is traveling directly at you at a speed of 200 mph and an altitude of 3000 ft, and you hear the sound at what seems to be an angle of elevation of 20°. At what angle u should you actually look in order to see the plane? Consider the speed of sound to be 1100 ft/sec.

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Perceived location of plane PR 3000 ft 1-- Actual location of plane when heard A 0 20° >V