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1. In a frictionless piston-cylinder device, helium expands from 1 to 3 ft3 . The process is described by P=740-400V+60V2 , where P is in
1. In a frictionless piston-cylinder device, helium expands from 1 to 3 ft3 . The process is described by P=740-400V+60V2 , where P is in psia and V in cubic feet. (60 points) a) Calculate P for the volumes 1, 2 and 3 ft3 and represent the process in a PV diagram. b) Determine the work done in lbf ft. c) Determine the heat transferred, in Btu.
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