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Chapter 15 | Thermodynamics
Figure 15.41
10. Would the previous question make any sense for an isochoric process? Explain your answer.
11. We ordinarily say that
ΔU = 0 for an isothermal process. Does this assume no phase change takes place? Explain your
12. The temperature of a rapidly expanding gas decreases. Explain why in terms of the first law of thermodynamics. (Hint:
Consider whether the gas does work and whether heat transfer occurs rapidly into the gas through conduction.)
13. Which cyclical process represented by the two closed loops, ABCFA and ABDEA, on the PV diagram in the figure below
produces the greatest net work? Is that process also the one with the smallest work input required to return it to point A? Explain
your responses.
Figure 15.42 The two cyclical processes shown on this
diagram start with and return the system to the conditions at point A, but they follow
different paths and produce different amounts of work.
14. A real process may be nearly adiabatic if it occurs over a very short time. How does the short time span help the process to
be adiabatic?
15. It is unlikely that a process can be isothermal unless it is a very slow process. Explain why. Is the same true for isobaric and
isochoric processes? Explain your answer.