Hot combustion gases enter a gas turbine at .8Mpa and 1500 K at a rate of 2.1 kg/s and exit at .1 Mpa and 800 K. If heat lost from the turbine to the surroundings at a rate of 150 kj/s find the power output of the gas turbine using constant and variable specific heat. (assume exhaust gases are the same as properties of air.