Question

Detrmine the quantity of heat conducted in thirty minutes through an iron plate 2.0 cm thick and
0:10m2
in area if the temperatures of the two sides are
0o
C and
20o
C. The coefficient of thermal conductivity of iron is 50.4 J/smC

9:1×106J

2:3×106J

4:1×106J

3:3×106J