You are driving a vehicle that has an automatic transmission. When you park on a hill, you should
A: Set the parking brake first, before you shift the transmission into Park.
B: Shift the transmission into Park, and leave the parking brake off.
C: Set the parking brake, and shift the transmission into Neutral.

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?