Solar radiation is incident on the outer surface of a spaceship at a rate of 420 btu/h·ft2. the surface has an absorptivity of αs = 0.10 for solar radiation and an emissivity of ε = 0.6 at room temperature. the outer surface radiates heat into space at 0 r. if there is no net heat transfer into the spaceship, determine the equilibrium temperature of the surface.

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.