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A hollow sphere of glass whose external ...

A hollow sphere of glass whose external and internal radii are `11cm` and `9cm` respec-tively is completely filled with ice at `0^(@)C` and placed in a both of boiling water How long will it take for the ice to melt completely ? Givne that density of ice `=0.9g//cm^(3)` latent heat of fusion of ice `=80 cal//g` and thermal conductivity of glass `=0.002 cal//cm-s^(@)C` .

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