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A piston-cylinder device contains 12 kg of saturated R-134a vapor at 3.2 bar. An electric source supplies 8 A current to a resistor within the cylinder for 4 minutes and there is heat transfer of 400 kJ to the system. During these energy interactions, the pressure is maintained constant in the cylinder. The refrigerant reaches a final temperature of 70 degree C. Determine (a) The voltage of the source. (b) Show the expansion process for the R-134a on a P-v diagram. Label states, show property values, and indicate appropriate lines of constant pressure.
In a refrigerator 1 kW is removed from the -10 degree C cold space and 1.3 kW is moved into the 30 degree C warm space. Find the exergy fluxes including direction associated with the two heat transfers.
the displacement function ux for a tensile specimen of uniform cross section and length l fixed at one end and
A Brayton cycle uses air and produces a net work of 14000 Btu/s with an inlet state of 60°F, 14.7 psi and a compression ratio of 16. The heat added in the combustion process is 400 Btu/lbm. If the thermal efficiency is 0.547 Determine: Using variabl..
a cylindrical log is 1 ft in diameter and 20 ft long. what weight of iron must be tied to one end of the log to keep it
a man of mass m1 walks along a plank of length l with a constant acceleration a relative to the plank. The mass of the plank is m2 and the coefficient of friction between the plank and the ground is mu. Find the distance the plank moves if the man..
A voltage signal is produced by a transducer. The signal contains its strongest frequency component at 50 Hz (amplitude = 5.0 V), plus a weaker component at the second harmonic (100 Hz) with amplitude 2.0 V. In addition, there is noise at 60 Hz with..
the 244000-lb space-shuttle orbiter touches down at about 230 mihr. at 193 mihr its drag parachute deploys. at 35 mihr
an important radionuclide produced in water-cooled nuclear reactors is 16n which has a half-life of 7.13 s and emits
describe the basics of the carnot cycle of thermodynamics and its application to heat engines such as diesel engines
an 84.5 kg hiker is trapped on a mountain ledge following a storm. a helicopter rescues the hiker by hovering above him
you need to drain a cylindrical reservoir to fix a crack. a reservoir is 10m high and has a diameter of 5m. there is an
a stationary tethered balloon contains helium gas an ideal gas here at 0.00degc and 0.0700 mpa at a height of 1000 m.
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