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An air-conditioning system operating on the reversed Carnot cycle is required to transfer heat from a house at a rate of 727 kJ/min to maintain its temperature at 21°C. If the outdoor air temperature is 39°C, determine the power required to operate this air-conditioning system. Report your answer in [kW] and round your answer to the second decimal places.
steam flowing in a supply line at 2000 kpa is throttled through a valve to 100 kpa and 120 deg c. determine the
a cylindrical graphite pure carbon rod of length 25 cm and initial diameter of 2 cm is inserted into a flowing air
Determine the temperature at which the diffusivity D of Cu in Al is twice the diffusivity at 500K. Using your result for D of Cu in Al at 500K, estimate the distance that a Cu impurity would diffuse in Al at 500 K after 1 hour. Use the simple estimat..
a student plays two notes on the piano keyboard simultaneously. the white key has a frequency of 352 hz and the black
How is the mechanical deformation energy defined? How do you calculate the work of fracture of a brittle material?
a room has walls and a ceiling that conduct heat from the room to the cooler outdoors. if the inside temperature is
An axially symmetric space vehicle with It/Ia= 10 is undergoing a general torque-free motion. The angle between the angular momentum vector H and the axis of symmetry is 45 deg.
1. consider a conical pendulum that is a ball of mass m at the end of a string of length li moving in a horizontal
If the efficiency of the turbine in converting the mechanical energy given up by the fluid to the turbine shaft is 89% (nt = 0.89), calculate the friction loss in the turbine in J/kg.
the support at a is a ball-and-socket joint that is incapable of supporting any moments. the tension in the cable
A 500-ml glass of chilled water at 100C degree is removed from a refrigerator. It slowly equilibrates to the room temperature of 250C degree. Calculate the entropy change of the water, the entropy change of the surroundings, and the entropy change of..
a thin-walled cylindrical gas vessel has a mean radius of 3 ft and a wall thickness of 12 in. the yield stress of the
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