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A hollow glass sphere whose thicknes is `2mm` and external radius is `10cm` is filled with ice and placed in a bath containing boiling water at `100^(@)C`. Calculate the rate of which the ice melts. Thermal conductivity of glass `=1.1Js^(-1) m^(-1) K^(-1)` and `L` of ice `=336xx10^(3)Jkg^(-1)`.

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The correct Answer is:
`[0.02 kgs^(-1)]`
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The ice is filled in a hollow glass sphere of thickness 2mm and external radius 10cm . This hollow glass sphere with ice now placed in a bath containing boiling water at 100^(@)C . Calculate the rate at which ice melts. Neglect volume change in ice. (Given, thermal conductivity of glas 1.1W//m//K , latent heat of ice =336xx10^(3)J//kg)

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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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