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The 40-cm-thick roof of a large room made of concrete k 0 79 W/m K α 5 088 10-7 m2 /s is initially at a uniform temperature of 15°C. After a heavy snow storm the outer

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

(b) 12.5°C

(c) 7.8°C

(d) 0°C

(e) -5°C

 

Jun 09 2020 View more View Less

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