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A house is maintained at steady state (closed system) at 300 K while the outside temperature is 280 K. The heat loss is measured at 2 kW. Two approaches are being considered: (A) electrical heating at 100% efficiency and (B) a heat pump that operates with a COP equal to 50% of the ideal value. The average daily price of electricity is $0.12/kWh. Determine the cost of options A and B over a 10 hour operating period.
find the moment of the 12-n force about the origin. the force is parallel to the x-axis and 5cm in the y-direction and
a solar dish-stirling engine system operates between the temperature of 500c and 30c. compute the ideal stirling
A ceramic matrix composite contains internal flaws as large as 120 ?m in length. The plane strain fracture toughness of the composite is 45 MP am, and the tensile strength is 550 MPa, assume f=1.0
consider the combustion of methane using 20 excess air with a methane conversion of 85. air enters at 300oc and methane
air enters the compressor of an ideal closed air-standard brayton cycle at 100kpa with a volumetric flow rate of 5m3s.
a capillary tube has an 8 mm diameter through which liquid fluorine refrigerant r-11 flows at a rate of 0.03 cm3s. the
a sample of wet silty clay soil has a mass of 126 kg. the following data were obtained from laboratory tests on the
A sealed piston-cylinder assembly contains 3 lbm of water. The water is initially at P1 = 40 psia and T1 = 300°F. The water undergoes two processes in series: Constant-temperature compression to Volumetric = 11.19 ft3, during which the water transfe..
A rigid tank contains 5 kg of saturated liquid-vapor mixture of H2O at 100 kPa and quality of 24.4%. A heat transfer process occurs until the H20 in the tank is a saturated vapor.
a gas power cycle compresses air at 1 bar and 300 k state 1 through an adiabatic reversible compressor to 6 bar state
two blocks a and b are connected by a cord passing over two pulleys c and d and e and f. at t 0 block a starts moving
You are given a sheet of steel with a modulus of rigidity is G = 80.8 Gpa, a length L = 1 m, width w = 100 mm, and thickness t = 1 mm. You are asked to design a shaft cross-section by shaping the given steel sheet. The machine that is available to yo..
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