Question

The pilot of an airplane reads the altitude 6400 m and the
absolute pressure 46 kPa when flying over a city. Calculate the
local atmospheric pressure in that city in kPa and in mmHg. Take
the densities of air and mercury to be 0.828 kg/m^{3} and
13,600 kg/m^{3}, respectively.

The local atmospheric pressure in the city in kPa is ?

The local atmospheric pressure in the city in mmHg is ?

Answer #1

(a) Calculate the absolute pressure at an ocean depth of 1250 m.
Assume the density of sea water is 1028 kg/m3 and that
the air above exerts a pressure of 101.3 kPa.
. Pa
(b) At this depth, what force must the frame around a circular
submarine porthole having a diameter of 28.0 cm exert to
counterbalance the force exerted by the water?
N

A jet engine is operating at an altitude of 7000 m. The mass of
air passing through the engine is 46 kg/s and the heat addition in
the combustion chamber is 500 kJ/kg. The cross-sectional area of
the combustion chamber is 0.5 m2, and the air enters the chamber at
a pressure of 80 kPa and a temperature of 80°C. After the
combustion chamber, the products of combustion, which can be
assumed to have the properties of air, are expanded...

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