# Past Exam for PHYS 4230 - Thermodynamics and Statistical Mechanics with Hermele at Colorado (CU)

## Exam Information

 Material Type: Exam 2 Professor: Hermele Class: PHYS 4230 - Thermodynamics and Statistical Mechanics Subject: Physics University: University of Colorado - Boulder Term: -- Keywords: Either...orTemperatureGeneral FormulaAssumptionsMacroscopicDistributionThermal EquilibriumSpeed of Light CSpeed of Light (c)Probabilities

## Sample Document Text

Physics 4230 Examination # 2 8 April 2005 In each problem, be sure to give the reasoning for your answer and de ne any variables you create. If you use a general formula, state that formula clearly before manipulating it. 1. [5 pts] Two systems, A and B, are placed in thermal contact with each other, but are otherwise isolated. Initially TA > TB. Make no assumptions about the dependence of S on U for either system. Determine whether each statement is true or false, including your reasoning. For example, you might cite a relevant thermodynamic law, or give a simple counterexample. A. A and B will always eventually come to the same temperature T. B. Heat will always ow from system A to system B. C. The entropy of each system will always increase. D. The energy of the total system will be minimized. E. The entropy of the total system will be maximized. 2. [3 pts] Two experiments are performed. In the rst, an ideal gas of N atoms at temperature Ti in volume Vi is allowed to expand to a nal volume...

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