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A cubical furnace with unknown dimensions (student needs to assume these dimensions), the furnace surfaces are...

A cubical furnace with unknown dimensions (student needs to assume these dimensions), the furnace surfaces are approximate black surfaces. The side surface of the furnace has the highest temperature and is equal to 1700 k, the base which consider surface 1 has 1000 K, and the lowest temperature is 600 at top surface. Determine:

(a) The net rate of radiation heat transfer between the base and side surface

b) The net rate of radiation heat transfer between base and top surface

(c) The net radiation heat transfer from the base

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