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 × 10–7 m2/s, determine the center and surface temperatures of the apples in 1 h. Also, determine the amount of heat transfer from each apple.
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