Question

Please give an example or an application in real life (or where it occurs) for the following:

a) If a flow is subsonic (Ma=u/a <1)

b) If a flow just reached the speed of sound (Ma=1)

c) If a flow is supersonic (Ma>1)

Please be specific

Answer 1

A)

• Subsonic aircraft, a flying machine that flies at air speeds lower than the speed of sound
• Subsonic ammunition, a type of bullet designed to avoid creating a loud shockwave when fired
• Subsonic flight, an aircraft flight at air speeds lower than the speed of sound in air

Subsonic and transonic wind tunnels.

B) Doppler effect examples.

C) For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately 343 m/s.