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A heat pump with a COP of 3.0 is used to heat air contained in a 1205.4m^3 of well-insulated, rigid tank. Initially the pressure and the temperature inside the gas tank are 100 kPa and 7 degrees Celsius, respectively. When running, the heat pump consumes 5kW of electric power. How long does it take for the heat pump to raise the temperature of air in the tank to 22 degrees Celsius?
a fountain produces a vertical jet of water which rises to a height of 30 m before falling back into a pond. if the jet
ore from gold mines is about 0.02 gold by mass. seawater contains gold too at about 1 part per trillion by volume. gold
a mass of 2.4 kg of air at 150 kpa and 12ordmc is contained in a gas-tight frictionless piston-cylinder device. the air
a contractor is required to prepare a soil surface so that its planar and the normal direction to the surface is within
a heat pump with a coefficient of performance of 3.5 provides energy at an average rate of 70000 kjh to maintain a
a 6 lb collar is constrained to travel along a frictionless vertical ring of r3 ft. the spring is attached to the
water is the working fluid in an ideal rankine cycle. superheated vapor enters the turbine at 8 mpa 480 degrees
an adiabatic gas turbine expands air at 1300 kpa and 500oc to 100 kpa and 127oc. air enters the turbine through a
assuming you have a thermometer and a device to measure the speed of sound in a gas explain how you can determine the
a rigid insulated container has two rooms seperated by a membrane. room a contains 1 kg air at 200 degrees celsius and
heat is added to a piston-cylinder device that initially contains 2 kg of water at 300 degc and a quality of 0.3. the
a 12 cantilever beam has a 4000 lb load at the end of the beam. draw the shear force and bending moment diagrams and
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