A 1-m·inner-diameter liquid-oxygen storage tank at a hospital keeps the liquid oxygen at 90 K. The tank consists of a 0.5-cm-thick aluminum (k = 170 W/m·K) shell whose exte- rior is covered with a 10-cm-thick layer of insulation (k = 0.02 W/m·K). The insulation is exposed to the ambient air at 20°C and the heat transfer coefficient on the exterior side of the insulation is 5 W/m2·K. The temperature of the exterior surface of the insulation is
(a) 13°C
(b) 9°C
(c) 2°C
(d) – 3°C
(e) –l2°C
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