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A tungsten sphere (r = 1.08 cm) is needed to be maintained at 3249 K....

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A tungsten sphere (r = 1.08 cm) is needed to be maintained at 3249 K. The walls of the enclosure, where it is suspended within, are at 260 K. Ignoring the heat conduction along the supports, calculate the needed power input. The emissivity of tungsten is 0.350.Express your answer in kW.

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