"Water is the working fluid in an ideal regenerative Rankine cycle with one open feedwater heater. Steam enters the turbine at 1400 lbf/in^2 and 1000 degrees F and expands it to 120 lbf/in^2, where some of the steam is extracted and diverted to the open feedwater heater operating at 120 lbf/in^2. The remaining steam expands through the second-stage turbine to the condenser pressure of 2 lbf/in^2. Saturated liquid exits the open feedwater heater at 120 lbf/in^2. The net power output of the cycle is 1x10^9 Btu/h. Determine for the cycle
a) the mass flow rate of steam entering the first stage of the turbine, in lb/h
b) the rate of heat transfer, in Btu/h, to the working fluid passing through the steam generator.
c) the thermal efficiency"