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Chapter Two
Fundamental Aspects of Compressible Flow
Dr. Tahseen Ahmad Tahseen
Question One
Suppose that a cruise missile under test is moving horizontally at M = 2, in the atmosphere at an
elevation of 305 m above the earth's surface. How long does it take for an observer on the ground
to hear the disturbance from the instant when it is directly overhead? Assume standard atmosphere
(15 "C). Ans. t= 0.777 sec.

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