Air enters the compressor of a cold air-standard brayton cycle at 100 kpa, 300 k, with a mass flow rate of 6 kg/s. the compressor pressure ratio is 10, and the turbine inlet temperature is 1400 k. the turbine and compressor each have isentropic efficiencies of 80%. for k=1.4, calculate: a) the thermal efficiency of the cycle. b) the back work ratio. c) the net power developed, in kw. d) the rates of exergy destruction in the compressor and turbine, respectively, each in kw, for t0=300 k.