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The only possibility of heat flow in a thermos flask is through its cork which is 75 cm2 in area and 5 cm thick. Its thermal conductivity is 0.0075 cal/cmsec∘ C. The outside temperature is 40∘ C and latent heat of ice is 80 cal g−1. Time taken by 500 g of ice at 0∘ C in the flask to melt into water at 0∘ C is |
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Answer» The only possibility of heat flow in a thermos flask is through its cork which is 75 cm2 in area and 5 cm thick. Its thermal conductivity is 0.0075 cal/cmsec∘ C. The outside temperature is 40∘ C and latent heat of ice is 80 cal g−1. Time taken by 500 g of ice at 0∘ C in the flask to melt into water at 0∘ C is
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