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A potato that may be approximated as a 57 cm solid sphere with the properties

A potato that may be approximated as a 5.7-cm solid sphere with the properties ρ = 910 kg/m3 ,

cp = 4.25 kJ/kg·K, k = 0.68 W/m·K, and α = 1.76 × 10-7 m2/s. Twelve such potatoes initially at 25°C are to be cooked by placing them in an oven maintained at 250°C with a heat transfer coefficient of 95 W/m2 ·K. The amount of heat transfer to the potatoes by the time the center temperature reaches 100°C is

(a) 56 kJ

(b) 666 kJ

(c) 838 kJ

(d) 940 kJ

(e) 1088 kJ

 

 

 

Jul 23 2020 View more View Less

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