3. For a closed simple compressible system operating with air as an ideal gas with molecular weight M as well as constant specific heats cp and cv where. The temperature T, pressure p, specific volume v and specific entropy s of two equilibrium states of this system are given as (T1, p1, v1, S1) and (T2, p2, v2, S2), respectively. The universal gas constant is. Please derive the following relations. (32%)
(c) For an isentropic process,