PHYS 157 Lecture Notes - Lecture 15: Isothermal Process
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A heat engine consists of a heat source that causes a monatomicgas to expand, pushing against a piston, thereby doing work. Thegas begins at a pressure of 285 kPa, a volume of 136 cm3, and roomtemperature, 20 °C. On reaching a volume of 421 cm3, the piston islocked in place, and the heat source is removed. At this point, thegas cools back to room temperature. Finally, the piston is unlockedand used to isothermally compress the gas back to its initialstate.
(a) Sketch the cycle on a pV-diagram.
(b) Determine the work done on the gas and the heat flow out of thegas in each part of the cycle.
isobaricprocess | isochoricprocess | isothermicprocess | |
work doneon the gas | |||
heat flowout of the gas |
(c) Using the results of part (b), determine the efficiency ofthe engine.