The diagram shows four states of a system, each with different internal energy, E.
(a)Which of the states of the system has the greatest internal energy?
(b) In terms of the ¢E values, write two expressions for the difference in internal energy between State A and State B.
(c) Write an expression for the difference in energy between State C and State D.
(d) Suppose there is another state of the system, State E, and that its energy relative to State A is ? E= ?E1 + ?E4 . Where would State E be on the diagram?
