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The emissivity of tungsten is 0.350. A tungsten sphere with a radius of 1.75 cm is...

The emissivity of tungsten is 0.350. A tungsten sphere with a radius of 1.75 cm is suspended within a large evacuated enclosure whose walls are at 315 K. What power input is required to maintain the sphere at a temperature of 3000K if heat conduction along the supports is negligible?

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