A stone of 0.36 m^(2) cross -sectional area and 0.1 m thickness has its lower surface in contact with water at 100^(@)C and upper surface in contact with ice at 0^(@)C. If 4.8 kg ice melting in 1 hour, then what is the thermal conductivity of stone ? Latent heat of fusion of ice is 3.36xx10^(5)" J/kg".

A stone of 0.36 m^(2) cross -sectional area and 0.1 m thickness has it

1.	A stone of 0.36 m^(2) cross -sectional area and 0.1 m thickness has its lower surface in contact with water at 100^(@)C and upper surface in contact with ice at 0^(@)C. If 4.8 kg ice melting in 1 hour, then what is the thermal conductivity of stone ? Latent heat of fusion of ice is 3.36xx10^(5)" J/kg".
Answer» `1.24" J/ms "^(@)C` `1.29" J/ms "^(@)C` `2.05" J/ms "^(@)C` `1.02" J/ms "^(@)C` Solution :`Q=KA((T_(1)-T_(2))/(L))t` `mL.=KA((T_(1)-T_(2))/(L))t` `:.K-(mL.xxL)/(A(T_(1)-T_(2))XXT)` `=(4.8xx3.36xx10^(5)xx0.1)/(0.36(100-0)xx3600)` `=1.24" J/ms "^(@)C`