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MEEN 315, SECTION 503 PRINCIPLES OF THERMODYNAMICS Fall 2009 Homework #1 Solutions DUE September 8, 2009 1. Suppose you insert a capped bottle of soda (originally at 20° C) into a refrigerator at 3° C. If you make the contents of the soda bottle your control system, are the contents a control volume or a control mass? Does the system soda undergo a process? Does it undergo a cycle? Is the system open or closed? What is the control system’s surroundings? Does anything cross the control surface? Is the control system isolated? Suppose you were told the system underwent a “quasi-equilibrium process”; describe what that would mean to the properties of the control system. Solutions: The control system is a closed system since mass does not transfer into or out of the control volume. This makes it a control mass. Yes, the soda bottle undergoes a cooling process as its temperature comes into equilibrium with the refrigerator space temperature. No, the soda bottle does not undergo a cycle, as it is not returned to an initial state. The system is closed. The control system’s surrounding is the refrigerator space. Yes, heat energy crosses the control surface. No, the control system is not isolated, since energy is transferred with the surroundings in the form of heat energy. If the system were to undergo a quasi-equilibrium process, that implies the process occurs slowly enough that the properties of the system are uniform at each instant in time. There would be no spatial variations in properties. 2. Identify the properties in the following list, provide the standard metric and English units, and state if each is intensive, extensive, or not a property: P, F, V, ν , ρ , T, m, L, t, and V . Solution: P – Pressure, [kPa], [psi], intensive. F – Force, [N], [lbf], not a property. V – Volume, [m
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This note was uploaded on 12/03/2009 for the course MEEN 315 taught by Professor Ramussen during the Spring '07 term at Texas A&M.

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