Problem 3 During the isothermal heat addition process of a Carnot cycle, 900 kJ of heat is added to the working fluid from a source at 400C. Determine: (a) The entropy change of the working fluid (10 points) (b) The entropy change of the source (10 points) (c) The total entropy change for the process (10 points) (d) Discuss your answer in part () why your answers 1s what it is (10 points)