(Solution) - The efficiency of the engines of subsonic airplanes depends on -(2025 Original AI-Free Solution)

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Academic Level: Undergrad. (yrs 3-4)

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The efficiency of the engines of subsonic airplanes depends on air pressure and usually is maximum near about 36000ft. Find the air pressure y(x) at this height without calculation. Physical information the rate of change y'(x) is proportional to the pressure, and at 18000ft the pressure has decreased to half its value y0 at sea level.