Air is compressed steadily by a compressor from 100 kpa and 17°c to 700 kpa at a rate of 5 kg/min. determine the minimum power input required if the process is
(a) adiabatic and
(b) isothermal. assume air to be an ideal gas with variable specific heats, and neglect the changes in kinetic and potential energies.

Apiston-cylinder device contains 0.1 m3 of liquid water and 0.9 m3 of water vapor in equilibrium at 800 kpa. heat is transferred at constant pressure until the temperature of water reaches 350 °c. determine (a) the quality of water at the initial state (b) the work associated with this process, (c) the heat associated with this process.