a 1 4th scale model of a new automobile design is tested in a wind tunnel. The reynolds number of the model is the same as that of the full scale prototype. assuming the model and prototype are exposed to the same air conditions, the velocity in the wind tunnel is then

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?