Air enters an insulated turbine operating at steady state at 120 psia, 900°r, and 500 ft/s. the exit conditions are 15 psia, 580°r, and 30 ft/s. there is negligible change in elevation. let t0 = 540°r, p0 = 15 psia. assuming constant specific heats at room temperature, determine the work developed and the exergy destroyed, each in btu/lbm of air. also find the maximum theoretical work that could be developed by a one-inlet, one-exit control volume with air entering and exiting at the specified states, and heat transfer with the surroundings at temperature t0. calculate the second law efficiency of this turbine. comment on the results.