A wheel tractor-scraper whose weight on the driving wheels is 36,000 lbs is a gross weight of 64,000 lbs. If the road surface is wet earth having a rolling resistance factor of 120 lb/ton, what is the maximum grade the scraper could ascend

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?