A thermocole cubical icebox of side 30 cm has a thickness of 5.0 cm if 4.0 kg of ice are put ini the box, estimate the amount of ice remaining after 6 h. The outside temperature is `45^@C` and coefficient of thermal conductivity of thermocole`=0.01 J//kg`.

A thermocole cubical icebox of side 30 cm has a thickness of 5.0 cm if

1.	A thermocole cubical icebox of side 30 cm has a thickness of 5.0 cm if 4.0 kg of ice are put ini the box, estimate the amount of ice remaining after 6 h. The outside temperature is `45^@C` and coefficient of thermal conductivity of thermocole`=0.01 J//kg`.
Answer» Area of six faces of the box`=6l^2=6xx(0.30)^2=0.54m^2` and `L=5.0cm=0.05cm` time, `t=6hr=6xx3600s` `T_1-T_2=45-0=45^@C` Total heat entering into the box in 6 hr `Q=(KA(T_1-T_2))/(L)` `=(0.01xx0.54xx45xx6xx3600)/(0.05)=104976J` If m be the amount of ice melted then `Q=mL` or `m=(Q)/(L)=(104976)/(335xx10^3)=-.313kg` Mass of the ice left after `6h=(4-0.313)kg` `=3.687kg`

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A thermocole cubical icebox of side 30 cm has a thickness of 5.0 cm if 4.0 kg of ice are put ini the box, estimate the amount of ice remaining after 6 h. The outside temperature is `45^@C` and coefficient of thermal conductivity of thermocole`=0.01 J//kg`.

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