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Question
A system is taken to its final state from initial state in hypothetical paths as shown figure calculate the work done in each case.
Solution
Data: PA = PB = 6 x 105 Pa, PC = PD = 2 x 105 Pa
VA = VD = 2 L, VB = VC = 6 L, 1 L = 10-3m3
(i) The work d one along the path A → B (isobaric process), WAB = PA (VB - VA)
= (6 x 105 Pa) (6 - 2) (10-3m3) = 2.4 x 103 J
(ii) WBC = zero as the process is isochoric
(V = constant).
(iii) The work done along the path C → D (isobaric process), WCD = PC (VD -VC)
= (2 x 105 Pa) (2 - 6) (10-3m3) = - 8 x 102J
(iv) WDA = zero as V = constant.
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