A500 m^3 rigid tank contains compressed air at 3mpa and 320 k. assume the environmental conditions are 290 kpa and 285 k. the gas constant of air is r=0.287 kpa. m^3/kg. k and the specific heats are cv = 0.722 kj/kgk and cp = 1.009 kj/kg-k. a. determine the quantity of μ1-μo. b. determine the quantity of v1-vo. c. determine the quantity of s1-s0. d. determine the exergy per unit φ mass at the end of the process. e. determine the minimum work requirement for this process.

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Plan an experiment to measure the surface tension of a liquid similar to water. if necessary, review the ncfmf video surface tension for ideas. which method would be most suitable for use in an undergraduate laboratory? what experimental precision could be expected?

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.