Answer: Consider a large commercial airplane cruising at a

Chapter 17, Problem 1737

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QUESTION:

Consider a large commercial airplane cruising at a speed of 1050 km/h in air at an altitude of 10 km where the standard air temperature is 2508C. Determine if the speed of this airplane is subsonic or supersonic.

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QUESTION:

Consider a large commercial airplane cruising at a speed of 1050 km/h in air at an altitude of 10 km where the standard air temperature is 2508C. Determine if the speed of this airplane is subsonic or supersonic.

ANSWER:

Step 1 of 3

The speed of an airplane and the air temperature are give. It is to be determined if the speed of this airplane is subsonic or supersonic.

We assume that air is an ideal gas with constant specific heats at room temperature.

The gas constant of air is . Its specific heat ratio at room temperature is .

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