The 747 airliner is capable of approximately Stephanie Saylor Fluid

Question 33 / 40: The 747 airliner is capable of approximately Mach 0.9 at altitude. The claimed air speed is about 590 mph. What is the temperature of air used in that calculation?

A −100 °C

B − 60 °C

C − 20 °C

D 0 °C

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Explanation:

The speed of sound in air does not depend much upon pressure but is proportional to the square root of absolute temperature. The advertised speed of sound is 590/0.9 = 660 mph. The speed of sound at 0 degrees C is about 740 mph. So the temperature at cruising altitude is about 213 degrees Kelvin.

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Fluid Mechanics ME201

Author:

Stephanie Redfern

The Saylor Foundation

USA

Access: Public Instant Grading

Attribution: Stephanie Redfern and Tuan Dinh. Fluid Mechanics. The Saylor Academy 2014, http://www.saylor.org/courses/me201/

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