5 kg of air is compressed according to a polytropic process with n=1.3 from (1 bar, 300K) to 1/2 of it's initial volume. (note that Q is not zero) 1. solve for the heat transfer and work. 2. solve for the entropy production (sigma) assuming Tb-300K 3. Set Q-0 and solve for n and the entropy production (sigma) 5 kg of air is compressed according to a polytropic process with n=1.3 from (1 bar, 300K) to 1/2 of it's initial volume. (note that Q is not zero) 1. solve for the heat transfer and work. 2. solve for the entropy production (sigma) assuming Tb-300K 3. Set Q-0 and solve for n and the entropy production (sigma)