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midterm2006solution - ME320 Midterm Exam Name Section 1...

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ME320 Midterm Exam October 24, 2006 Name: Section: 1. Short questions (25 points) a. For a system to be in thermodynamic equilibrium, must the tem- perature and the pressure be the same everywhere? Solution: For a system to be in thermodynamic equilibrium, the tempera- ture has to be the same everywhere but the pressure can change. However, there should be no unbalanced pressure forces present. The increasing pressure with depth in a fluid, for example, should be balanced by increasing weight. b. What is the physical significance of the two constants that appear in the van der Waals equation of state? Solution: The constant a represents the increase in pressure as a result of attractive intermolecular forces; the constant b represents the volume occupied by the molecules. c. Can the specific internal energy of an ideal gas change during an isothermal process? (Explain your answer.) Solution: No. The specific internal energy of an ideal gas depends only on the absolute temperature.
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