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A reversible heat pump cycle operates between hot and cold reservoirs at TH = 27°C and TC = -3°C, respectively. Determine the fraction of the heat transfer QH discharged at TH provided by (a) the net work input, (b) the heat transfer QC from the cold reservoir TC.
a pitot-static tube used to measure air velocity is connected to a differential pressure gage. if the air temperature
a steel angle iron loaded in compression is added to a structure in order to increase its rigidity. although the two
a trailer truck enters a 2 percent uphill grade traveling at 72 kmh and reaches a speed of 108 kmh in 300 m. the cab
the temperature in a vessel is 36 degree c and the proportion by mass of air to dry saturated steam is 0.1. what is the
the 10-kg sphere c is released from rest when theta0 and the tension in the spring is 100 n. determine the speed of the
an automobile battery is modeled as a 12v ideal voltage source in series with a 0.3 ohm internal resistance. it is to
nitrogen gas at 60 kpa and 7deg c enters an adiabatic diffuser steadily with a velocity of 275 ms and leaves at 85 kpa
a tank open to the atmosphere initially contains 2 lb of liquid water initially at 80degf and 0.4 lb of ice initially
r-134a is contained in a vertical cylinder fitted with a frictionless piston and a set of stops and the volume is
a seismic instrument has a natural frequency of 20 hz and a damping ratio of 0.65. determine the maximum input
air enters an adiabatic nozzle steadily at 300 kpa 200degcand 28 ms and leaves at 100 kpa and 168 ms. the inlet area of
saturated steam at 2 mpa is contained in a piston-cylinder device. the initial volume is 0.25 m3. heat is slowly
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