The efficiency of the engines of subsonic airplanes depends on air pressure and is usually maximum near
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The efficiency of the engines of subsonic airplanes depends on air pressure and is usually maximum near 35,000 ft. Find the air pressure y(x) at this height. Physical information. The rate of change y'(x) is proportional to the pressure. At 18,000 ft it is half its value y0 = y(0) at sea level. Remember from calculus that if y = ekx, then y' = kekx = ky. Can you see without calculation that the answer should be close to y0/4?
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