A person puts a few apples into the freezer at 15 °C to cool them quickly for guests who are about to arrive. Initially, the apples are at a uniform temperature of 20 °C, and the heat transfer coefficient on the surfaces is 8 W/m2·°C. Treating the apples as 9 cm diameter spheres and taking their properties to be ρ = 840 kg/m3, Cp = 3.81 kJ/kg·°C, k = 0.418 W/m·°C, and α = 1.3 X 10-7 m2/s, determine the centre and surface temperatures of the apples in 1 h. Also, determine the amount of heat transfer from each apple.
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Education serves several functions for society. These include (a) socialization, (b) social integration, (c) social placement, and (d) social and cultural innovation.
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Education serves several functions for society. These include (a) socialization, (b) social integration, (c) social placement, and (d) social and cultural innovation.
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