Air enters the compressor of an air-standard brayton cycle with a volumetric flow rate of 60 m3/s at 0.8 bar, 280 k. the compressor pressure ratio is 20, and the maximum cycle temperature is 1800 k. for the compressor, the isentropic efficiency is 92% and for the turbine the isentropic efficiency is 95%. determine: a) the net power developed, in mw, b) the rate of heat addition in the combustor, in mw, c) the thermal efficiency of the cycle.