An aircraft flying below the tropopause descends at a constant True Airspeed. Its Mach. No. will
•  not change.
•  increase.
•  decrease.

subufer asking:
•  True airspeed/speed of sound = mach number. So if descending below tropopause doesn’t it mean that Mach number will increase at constant aircraft airspeed? Since the temperature will rise?
Or I am getting it wrong?

Community comments: 1

As altitude increases, pressure
•  decreases exponentially.
•  decreases at constant rate.
•  increases exponentially.

davide_gibbo asking:
•  Isn't:-1hPa in 27ft. So why it decreases exponentially?

Community comments: 0

The working fluid of a gas turbine engine is
•  gasoline.
•  kerosene.
•  air.

MartonA98 asking:
•  Can anyone help me with this question?

Community comments: 0

1kg of water is heated from 0 degrees C to 2 degrees C. Its volume will
•  decrease.
•  stay the same.
•  increase.

p.pukelis asking:
•  Nevermind, i found out that heating water until 4 celsius decreases it's volume and after that it starts to increase

Community comments: 1

1kg of water is heated from 0 degrees C to 2 degrees C. Its volume will
•  decrease.
•  stay the same.
•  increase.

p.pukelis asking:
•  Shouldn't volume increase with the increase of temperature? Maybe someone has an explanation or is this question wrong.

Community comments: 0