Movers often use a ramp (an inclined plane) to move large objects into their trucks more easily. Suppose that movers have to exert a force of 1000 N to push a large box 4 m up a ramp. How much force would it take to lift the box 1 m straight up into the truck without using the ramp?

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?