A Solid Concrete Wall 4

Multiple Choice

A solid concrete wall 4.0 m by 2.4 m and 30 cm thick, with a thermal conductivity of 1.3 W/(m∙K) , separates a basement at 18°C from the ground outside at 6°C. How much heat flows through the wall in one hour?

A) 1.8 MJ
B) 1.8 kJ
C) 500 J
D) 5.0 MJ
E) 5.0 kJ