A watermelon initially at 35°C is to be cooled hy dropping it into a lake at 15°C. After 4 h and 40 min of cooling, the center temperature of watermelon is measured to be 20°C. Treating the watermelon as a 20-cm-diameter sphere and using the properties k = 0.618 W/m · °C, α = 0.15 × 10-6 m2/s, ρ = 995 kg/m3, and cp = 4.18 kJ/kg · °C, determine the average heat transfer coefficient and the surface temperature of watermelon at the end of the cooling period.
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