Determine the minimum length of a crest vertical curve on a freight and passenger intercity main line track, connecting two tangents of 0.75% and 1.5% traveling at 70 mi/hr. hoel, lester a.. transportation infrastructure engineering: a multimodal integration (p. 389). cengage textbook. kindle edition.

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?