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·K. Treating the apples as 9-cm-diameter spheres and taking their properties to be ρ = 840 kg/m³, c_p = 3.81 kJ/kg·K, k = 0.418 W/m·K, and α = 1.3 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. Solve this problem using analytical one-term approximation method (not the Heisler charts).