The emissivity of tungsten is 0.350. A tungsten sphere with a radius of 1.80 cm is suspended within a large evacuated enclosure whose walls are What power input is required to maintain the sphere at a temperature of 2900.0 K if heat conduction along the at a temperature of 300.0 K. supports is neglected? Take the Stefan-Boltzmann constant to be 5.67x10-8 W/(m? . K4). Express your answer in watts. VO AEd ? P = W