The 40-cm-thick roof of a large room made of concrete (k = 0.79 W/m K, = 5.88
The 40-cm-thick roof of a large room made of concrete (k = 0.79 W/m · K, α = 5.88 × 10-7 m2/s) is initially at a uniform temperature of 15°C. After a heavy snow storm, the outer surface of the roof remains covered with snow at 25°C. The roof temperature at 18.2 cm distance from the outer surface after a period of 2 hours is (a) 14°C
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