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Spheres of 40-mm diameter heated to a uniform temperature of 400°C are suddenly removed from the oven and placed in a forced-air bath operating at 25°C with a convection coefficient of 300 W 1m:!. . K on the sphere surfaces, the thermo physical properties of the sphere material are p = 3000 kg/m3, c = 850 J/kg · K, and k = 15 W/m · K.
(a) How long must the spheres remain in the air bath for 80% of the thermal energy to be removed?
(b) The spheres are then placed in a packing carton that prevents further heat transfer to the environment. What uniform temperature will the spheres eventually reach?
the carpenter builds the square frame abcd and then braces it with member ef as shown in order to prevent racking
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Refrigerant 22 enters an insulated compressor operating at steady state as saturated vapor at -16oC with a mass flow rate of 1.5 kg/s. Refrigerant exits at 7 bar, 70oC. Changes in KE and PE from inlet to exit can be ignored. Determine: (a) the volume..
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One kilogram of air in a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes: Process 1-2: Constant specific volume At state 1, the temperature is 323 K, and the pressure is 1 bar. At state 2, the pressure is 2 bar...
Decorative water fountains consist of a water reservoir and underground piping to and from a pump. One such system is shown schematically in the figure. The pipe material is PVC (a table is provided). The outlet line from the pump is 18 m and the inl..
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