Air flows at the rate of 1kg/s through a convergent-divergent nozzle. The entrance area is 2x10^-3 m^2 and the inlet temperature and pressure are 438 K and 580 kPa. If the exit pressure is 140 kPa and the expansion is isentropic, find;
a-The velocity at entrance
b-The stagnation temperature and stagnation pressure
c-The throat and exit areas
d-The exit velocity