1. The atmospheric temperature at an altitude of 1km, 2.5Km and 4.0 Km
2. The approximate sonic velocity at the 3 altitudes
given in 1 above.
3. The density ratio at the 3 altitudes given in 1
above.
The outside air temperature at sea level is 20°C.

Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg • k, determine for the air the amount of entropy produced, in kj/k