1. Air in an isentropic process and at P o = 250 kPa and T o = 600 K is expanded through the throat.

1. Air in an isentropic process and at Po = 250 kPa
and To = 600 K is expanded through the throat to an exit Mach number
of 2.5. The throat diameter is 11 cm. Find a) the mass flow rate of air, b) the
air pressure and temperature at the exit, c) exit velocity and area.

2. A fully inflated tire has a volume of 15 ft3.
The pressure and temperature of the air in the tire are 65 psia and 75 F,
respectively. At this condition, the air intake needle is depressed for 3 s and
then released. Treating air as an ideal gas and assuming small changes in the
tire temperature and volume, Find the amount
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1. Air in an isentropic process and at Po = 250 kPa
and To = 600 K is expanded through the throat to an exit Mach number
of 2.5. The throat diameter is 11 cm. Find a) the mass flow rate of air, b) the
air pressure and temperature at the exit, c) exit velocity and area.

2. A fully inflated tire has a volume of 15 ft3.
The pressure and temperature of the air in the tire are 65 psia and 75 F,
respectively. At this condition, the air intake needle is depressed for 3 s and
then released. Treating air as an ideal gas and assuming small changes in the
tire temperature and volume, Find the amount of air that left the tire. Assume
a discharge coefficient of 0.61 and a flow area of 0.01 in2.

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