A 25-cm diameter black ball at 130°C is suspended in air, and is losing heat to the surrounding air at 25°C by convection with a heat transfer coefficient of 12 W/m2•°C, and by radiation to the surrounding surfaces at 15°C. The total rate of heat transfer from the black ball is
(a) 217 W
(b) 247 W
(c) 251 W
(d) 465 W
(e) 2365 W
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