Apiston-cylinder holds air at an initial pressure of p1=100 kpa and temper ature of t=2c the piston-cylinder (which holds the air at constant pressure) is heated until its volume doubles from an initial volume of v1 1000 cm3 to a final volume of to v2 2000 cm2 (for air: r 0.2870 kj/kg/k, cp-1.005 k/kgk, c,-0.718 k/kg/k) a)- find the heat transferred to the water (kj) b)- find the work done by the piston-cylinder (kj).

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Fluids at rest possess no flow energy. a)- true b)- false

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater