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1. An inventor claims to have developed a food freezer that at steady state requires a power input of 0.6 kW to extract energy by heat transfer at a rate of 3000 J/s from freezer contents at 270 K. Evaluate this claim for an ambient temperature of 293 K.
2. An inventor claims to have developed a refrigerator that at steady state requires a net power input of 0.7 horsepower to remove 12,000 Btu/h of energy by heat transfer from the freezer compartment at 08F and discharge energy by heat transfer to a kitchen at 708F. Evaluate this claim.
a piston-cylinder device initially contains 0.6 m3 of water vapor at 250 kpa. the specific volume and specific internal
an amplifier circuit has a gain of 85 db. if the magnitude of the input voltage to the amplifier is12 mv what is the
air enters a regenerator at a pressure of 1mpa temperature of 550 k and mass flow rate of 800 kkgmin. heat is
a find the crank position corresponding to the maximum piston velocity for an in-line slider crank mechanism. crank
manufacturing does not require a final shaping operation. Cooling the outer layer of ceramic quickly may leave it in residual. Ceramics based on SiO2 are known as
to determine the specific volume v and specific internal energy u for some solids and liquids is it more important that
a refrigerator freezer compartment is maintained at a temperature of -15degf by removing heat at a rate of 4500 btuhr.
water at atmospheric pressure boils on the surface of a large horizontal copper tube. the heat flux is 90 of the
A 6-kg plastic tank that has a volume of 0.18m^3 is filled with liquid water. Assuming the density of water is 1000 kg/m^3, determine the weight of the combined system
a peripheral milling operation is performed on the top of a rectangular workpiece that is 650 mm long 50 mm wide and
A rigid tank has a volume of 23.3 m3 and due to safety requirements its pressure should not exceed 105 bar. If the tank has been filled with 1000kg of water vapor and is heated to 360°C check to see if it is within safety requirements.
a basketball of mass 0.570 kg is dropped from rest from a height of 1.25 m. it rebounds to a height of 0.734 m. a how
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