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A cylinder containing 0.9 kg of ammonia has an externally loaded piston. Initially the ammonia is at 2 MPa, 180°C and is now cooled to saturated vapor at 40°C, and then further cooled to 20°C, at which point the quality is 50%. Find the total work for the process, assuming a piecewise linear variation of P versus V.
an air conditioner based on the ideal vapor-compression refrigeration cycle uses r134a as the working fluid. states
a machine with a rotating shaft has a total weight of 90 kg and is supported by springs. the damping constant for the
refrigerant 134a at 140 f 60c and 125 psia 840 kpa enters the condenser of a chiller at 800lbh .1 kgs and exits as a
an engineer is designing a system that requires transporting .01 m3s of helium at 15degc and 120 kpa. the velocity of
Describe on your own words the three strengthen mechanism for metals (i.e. grain size reduction, solid solution strengthening and strain hardening). Be sure to explain how dislocations are involved in each of the strengthening techniques.
a seaplane is flying at 100 mph through air at 45 f. at what distance from the leading edge of the underside of the
a projectile is fired at t 0 with an initial velocity of vi at an angle of ? with respect to the horizontal towards
nitrogen gas is heated in a steady-state steady-flow process. the inlet conditions are 550 kpa 35degc and the exit
a fluid of viscosity micro is placed between two horizontal circular disks of the same radius r. the disk at z 0 is
a thin plate heater is attached to the higher surface of 8 mm thickness aluminum horizontal plate which has thermal
a gas turbine assume ideal brayton cycle has a pressure ratio of 10. it is connected to an electric generator with an
a refrigerator operates with a coefficient of performance of 4.2 and requires an electrical input of 700 w. determine
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