A Styrofoam box, used to keep drinks cold at a picnic, has total wall area (including the lid) of 0.8m^(2) and wall thickness 2 cm. It is filled with ice, water and coca-cola at 0^(0)C. What is the rate of heat flow between the box and the surrounding and in which direction it is flowing ? Take atmospheric temperature as 30^(0)C. Thermal conductivity of Styrofoam is 0.01 W/m-K.

A Styrofoam box, used to keep drinks cold at a picnic, has total wall

1.	A Styrofoam box, used to keep drinks cold at a picnic, has total wall area (including the lid) of 0.8m^(2) and wall thickness 2 cm. It is filled with ice, water and coca-cola at 0^(0)C. What is the rate of heat flow between the box and the surrounding and in which direction it is flowing ? Take atmospheric temperature as 30^(0)C. Thermal conductivity of Styrofoam is 0.01 W/m-K.
Answer» 12 W, Out of BOX 12W, Into the box 18W, Out of box 18W, Into the box Answer :B