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A hollow sphere of glas whose external a...

A hollow sphere of glas whose external and internal radii are 11 cm and 9 cm respectively is completely filled with ice at `0^@C` and placed in a bath of boiling water. How long will it take for the ice to melt completely? Given that density of ice = `0.9 g//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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