# Air is compressed polytropically along a path for which n= 1.3 in a closed system. The initial temperature and pressure are 17°C and 100kPa, respectively, and the final pressure is 500kPa. Assume R = 0.287 kJ/kg-K and average specific heats c, = 0.723 kJ/kg-K and cn = 1.01 kJ/kg.K. Find: a) the expansion ratio (v2/v1) b) the final temperature (T2) in K. e) the specific work done on the gas (-2)in k/kg d) the change of specific internal energy (uz – u), in kJ/kg. e) the specific heat transfer (91-2), in kJ/kg.

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