Chapter 7, Problem 7.20P

1. Kittel Ch3-1. Free energy of a two state system. (a) Find an expression for the free energy as a function of 7 of a system with two states, one at energy 0 and one at energy E. (b) From the free energy, find expressions for the energy and entropy of the system. The entropy is plotted in Figure 3.11.

An amount of 4000 BTU of heat is transferred from a reservoir at 800 deg. F to a reservoir at 200 deg. F. Find the entropy change of the system.

3.56 Refrigerant-12 in a piston/cylinder arrangement is initially at 50° C, x = 1. It is then expanded in a process so that P = Cv to a pressure of 100 kPa. Find the final temperature and specific volume.

A piston cylinder has 2.2kg of air at 300 K and 150 kPa. It is now heated up in a two step process. First constant volume to 1000 K (state 2) then followed by a constant pressure process to 1500 K, state 3. Find the final volume and final pressure.   (R of air = 0.287 KJ/kg K)

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QUI A piston-cylinder device with a set of stops initially contains 300 g of steam at 1000 Kpa and 400 C. Find the work if the final state IMpa and 250 C, and work if the position of the stops corresponds to 60% of the initial volume and also find the temperature at the final state if P-500Kpa Steam 300 g 1000 Kpy 400°C e

4.43 A piston/cylinder assembly contains 3 kg of air at 20°C and 300 kPa. It is now heated in a constant pressure process to 600 K. a. Find the final volume. b. Plot the process path in a P--v diagram. c. Find the work in the process.

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Water at 2.5 MPa and 200o C is heated at constant temperature up to a quality of 80%. Find: a. quality of heat received by water b. heat transferred c. work of a nonflow process.