10.17 A 'thermacole' icebox is a cheap and an efficient method for storing small…

PHYSICS · Subjective · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

10.17 A 'thermacole' icebox is a cheap and an efficient method for storing small quantities of cooked food in summer in particular. A cubical icebox of side 30 cm has a thickness of 5.0 cm . If 4.0 kg of ice is put in the box, estimate the amount of ice remaining after 6 h . The outside temperature is 45∘C45^{\circ} \mathrm{C}, and co-efficient of thermal conductivity of thermacole is 0.01 J s−1 m−1 K−10.01 \mathrm{~J} \mathrm{~s}^{-1} \mathrm{~m}^{-1} \mathrm{~K}^{-1}. [Heat of fusion of water =335×103Jkg−1=335 \times 10^{3} \mathrm{J} \mathrm{kg}^{-1} ]

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