A thermodynamic system is taken from state a to state c in the figure (Figure 1)along either path abc or path adc. Along path abc the work W done by the system is 450J. Along path adc, W is 120J. The internal energies of each of the four states shown in the figure are Ua=150J, Ub=240J, Uc=680J, and Ud=330J.
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