A 1-m-inner diameter liquid oxygen storage tank at a hospital keeps the liquid oxygen at 90 K. This tank consists of a 0.5-cm-thick aluminum (k = 170 W/m•K) shell whose exterior 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 20oC 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) 13oC
(b) 9oC
(c) 2oC
(d) -3oC
(e) -12°C
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