The plane flies at a speed of 900 km / h. Is this plane supersonic? Take the speed of sound equal to 330 m / s.
| August 6, 2021 | education
An airplane is called supersonic if its speed Vs is greater than the speed of sound propagation in air, which is Vs = 330 m / s.
The speed of this aircraft is Vс = 900 km / h. This means that in 1 hour of its movement it flies a distance of 900 km. Let’s convert time from hours to seconds, and distance from kilometers to meters.
1 hour = 60 minutes = 60 * 60 s = 3600 s.
900 km = 900 * 1000 m = 900000 m.
Vс = 900 km / h = 900000 m / 3600 s = 250 m / s.
We see that the speed of the aircraft Vs = 250 m / s is less than the speed of sound Vs = 330 m / s.
Vs = 250 m / s <Vs = 330 m / s.
Answer: the plane is not supersonic.
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