A gas undergoes three processes in series that complete a cycle:

Process 1–2: compression from p1  10 lbf/in.2 , V1  4.0 ft3 to p2  50 lbf/in.2 during which the pressure–volume relationship is pv constant

Process 2–3: constant volume to p3 p1

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Process 3–1: constant pressure

Sketch the cycle on a p–V diagram and determine the net work for the cycle, in Btu.

The driveshaft of a building’s air-handling fan is turned at 300 RPM by a belt running on a 0.3-m-diameter pulley. The net force applied circumferentially by the belt on the pulley is 2000 N. Determine the torque applied by the belt on the pulley, in and the power transmitted, in kW.

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