Question

A jet is flying at a speed of 356 m/s in an air temperature of 25.0 C. What is the Mach number of the jet

Answer 1

By definition, the Mach number is given as follows:

$$M = \dfrac{u}{c}$$

where $u = 356m/s$ is the speed of the jet, and $c=346m/s$ is the speed of sound in air at temperature of 25.0 C. Thus, obtain:

$$M = \dfrac{356m/s}{346m/s} \approx 1.03$$

Answer. 1.03.