Why do historians continue to gather historical evidence for even well-known events? They want to find artifacts to sell.
They are looking for evidence to predict the future.
They know that new evidence may lead to new interpretations.
They assume that new technology will prove all of the old theories incorrect.

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.