A fruit with a diameter of 8 cm (k=0.5 W/m °C, a=1.5*10") and uniform temperature of 25°C, was frozen in a refrigerator at -2°C by circulating flow of the air at velocity of 0.2 m/s and its average...

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Extracted text: A fruit with a diameter of 8 cm (k=0.5 W/m °C, a=1.5*10") and uniform temperature of 25°C, was frozen in a refrigerator at -2°C by circulating flow of the air at velocity of 0.2 m/s and its average heat transfer coefficient between fruit and air of 25 W/m2 °C. a) How long does the temperature at the fruit's center was decreased 20°C from the initial state b) The lowest temperature of this fruit at that calculated time [from question (a)]