A carpenter builds a solid wood door with dimensions 1.90 m x0.95 m x 5.0 cm. Its thermal conductivity is k=0.120

A carpenter builds a solid wood door with dimensions 1.90 m x0.95 m x 5.0 cm. Its thermal conductivity is
k=0.120 W/(m K). The air films on the inner and outer surfaces of the door have the same combined thermal resistance as
an additional 2.1 cm thickness of solid wood. The inside air temperature is 20.0 °C, and the outside air temperature is -6.0 °C.
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