A 5-m·diameter spherical tank is filled with liquid oxygen (p = 1141 kg/m cp =1.71 kJ/kg-°C) at - 184°C. It is observed that the temperature of oxygen increases to – 183°C in a 144–hour period. The average rate of heat transfer to the tank is
(a) 124W
(b) 185 W
(c) 246 W
(d) 348 W
(e) 421 W
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