A box with a total surface area of 1.88 m^2
and
a wall thickness of 2.44 cm is made of an insulating material. A 14.1 W electric heater
inside the box maintains the inside temperature at 18.6
◦C above the outside temperature.
Find the thermal conductivity of the insulating material.
Answer in units of W/m ·
◦ C.
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