You read a research study that concludes that the higher a student's self-esteem, the better he performs in school. This sort of relationship would best be characterized as

(1pts)

a negative correlation

a positive correlation

cause and effect

no relationship

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?