The emissivity of tungsten is 0.350. A tungsten sphere with radius 1.81 cm is suspended within a large evacuated enclosure whose walls are at 319 K. What power input is required to maintain the sphere at 3,070 K if heat conduction along the supports is ignored? Express your answer in two decimal places and in terms of kilowatts. (Stefan-Boltzmann constant = 5.670374419..x10-8 w-m-2.K¯4.)

The emissivity of tungsten is 0.350. A tungsten sphere with radius 1.81 cm is suspended within a large evacuated enclosure whose walls are at 319 K. What power input is required to maintain the sphere at 3,070 K if heat conduction along the supports is ignored? Express your answer in two decimal places and in terms of kilowatts. (Stefan-Boltzmann constant = 5.670374419..x10-8 w-m-2.K¯4.)