The emissivity of tungsten is 0.350. A tungsten sphere of radius 1.50 cm is suspended inside a large evacuated cavity whose walls are at 290 K. A) What power input is required to maintain the sphere at 3000 K if heat conduction by the supports is neglected? B) If the power supplied to the sphere is less than the value calculated in the previous point, what will happen with the equilibrium temperature of the sphere? C) Comment qualitatively, with respect to heat transfer, what would happen if the supports that suspend the sphere are not negligible and the cavity where the sphere is, is not in a vacuum but contains air