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At steady state, a heat pump driven by an electric motor maintains the interior of a building at Th=293 K. The rate of heat transfer, in kJ/h, from the building through its walls and roof is given by 8000 (Th-Tc), where Tc is the outdoor temperature. Plot the minimum theoretical electric power, in kW, required to drive the heat pump versus Tc ranging from 273 K to 293 K.
The lift force on a Wortmann air foil is measured five times under the same experimental conditions. The acquired values are 10.5N, 9.4N, 9.1N, 11.3N, and 9.7N. Assuming the true lift force is 10.7N; calculate a) the systematic error, b) random error..
consider a space ship in a stationary orbit around a planet. the potential energy of the ship is u-kmr where kgm is
a hydrogen tank 25 cm in diameter and 80 cm in height is charged to 150 atmospheres at room temperature 25 c. a
Find the Temperature of the Refrigerant, A closed vessel with a volume of 2 ft^3 contains 5 lb of Refrigerant 134a. A pressure sensor in the tank wall reads 71.39 lbf/in.^2 (gage).
a solid cube of wood having dimensions of 0.5 m3 is floating in water with 0.3 m of its dimension above the surface.
air at a stagnation pressure of 450 kpa and stagnation temp of 400k flows through a converging nozzle whose throat area
two kilograms of water execute a carnot power cycle. during the isothermal expansion the water is heated until it is a
Material D has a molecular weight of 213.45 g/mol and material E has a molecular weight of 75.12 g/mol. You desire to have a mixture of 15 mol % D. How much D is required to be added to 500 g of E to make this mixture?
a spherical balloon is inflated from a diameter of 10 cm to a diameter of 20 cm by forcing air into the balloon with a
steel rods of 0.05m diameter are heat treated by being passed through a heat-treating furnace in which the atmosphere
Determine the factor of safety against net section yield in the presence of the crack and determine the factor of safety against brittle fracture for the same conditions.
compute the estimated endurance strength for a 20.0mm-diameter rod machined from aisi 5160 oqt 1300 steel and subjected
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