PROBLEMS TO BE WRITTEN UP AND TURNED IN AT RECITATION

     This problem is due at the beginning of lecture on Wed 04/27.  The 
     problem should be written on a single sheet of paper (front and back), 
     or if multiple sheets are used, staple them together.  For full credit,
     the work must be neat, with clearly labeled diagrams (if useful).  The 
     labels must be in BOTH words and symbols.  For each part of the problem, 
     you must BRIEFLY explain your strategy in words, as well as neatly 
     showing your physics equations and math, with proper units. 

               Wolfson Chapter 22 problem 67, p. 567. (10 points)

     Show your work for each part of the problem.  Make sure that
     you explicity show that DeltaS for the cycle = 0 by calculating
     EACH of DeltaS_AB, DeltaS_BC, DeltaS_CD, and DeltaS_DA in
     the course of your calculations.  GBA