An observer on the ground notices an airplane flying horizontally at an altitude of 4000 m...
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An observer on the ground notices an airplane flying horizontally at an altitude of 4000 m in air (y-1.4, R=287 N*m/(kg K)) with air average temperature of 10 C: a. The aircraft is 10 km past him when the observer first hears it. Estimate the speed of airplane. b. The aircraft flies with (a) Ma=0.95 and (b) Ma=1.01. Is there a zone of silence for each of the cases? If so, what is its shape and what is the value of parameter (angle) that determines the shape quantitatively? An observer on the ground notices an airplane flying horizontally at an altitude of 4000 m in air (y-1.4, R=287 N*m/(kg K)) with air average temperature of 10 C: a. The aircraft is 10 km past him when the observer first hears it. Estimate the speed of airplane. b. The aircraft flies with (a) Ma=0.95 and (b) Ma=1.01. Is there a zone of silence for each of the cases? If so, what is its shape and what is the value of parameter (angle) that determines the shape quantitatively?
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