1. A gas is at some initial P, V, and T. Rank the following processes
by the change in the entropy of the gas as it increase in T by a small
DT. Explain using equations. (a) constant pressure
process (b) adiabatic process (c) constant volume process
2. Suppose that an inventor claims that a new engine has an efficiency of 0.61. The engine operates between energy reservoirs at 4 degrees C and 0 degrees C. It is a complicated device, with many pistons, gears, and pulleys, and the cycle involves freezing and melting. Does the claim of e=0.61 seem reasonable? Prove or disprove the claim.
From the textbook:
T8: B.5, B.7, S.5, S.7, S.10
T9: B.2, S.14
Last updated February 9, 2005