A cylinder fitted with a frictionless piston contains 5 kg of superheated R134a vapor at 1000 kPa and 140 C∘. The setup is cooled at constant pressure until the R134a reaches a quality of 25%. Calculate the work done in the process.
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A frictionless piston-cylinder device contains 5 kg of nitrogen at 100 kPa and 250 K. Nitrogen is now compressed slowly according to the relation until it reaches a final temperature of 360 K. Calculate the work input during this process.
A vertical frictionless piston-cylinder device contains gas at 180 kPa absolute pressure. The atmospheric pressure outside is 100kPa and the piston area is 25 cm2. Determine the mass of the piston.
