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The roof of an electrically heated house

measures 4.0 m long, 6.1 m wide, and 0.2 m

thick, and is constructed of a flat layer of

concrete whose thermal conductivity is k =

0.7 W m¹ K-¹. The internal temperature is

measured to be 23.6 °C while the external

temperature was measured at 11.4 °C.

Determine the amount of heat lost through

the roof in Watts to 1 decimal place

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Roof

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