The stagnation pressure indicated by a Pitot tube mounted on an airplane in flight is 41.94 kPa (abs). If the aircraft is cruising in standard atmosphere at an altitude of 8000 m, determine (a) the speed, (b) the Mach number.

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?