A gas turbine power plant is being designed using an air standard Brayton cycle. Air enters the compressor at 100kPa,300 K, with the volumetric flow rate of 5 m3/s. The turbine inlet temperature is expected to be 1400 K. For a compressor pressure ratio of 10 , determine (a) the thermal efficiency and (b) the back work ratio of the power plant. (Av) 1=5m/3