A hollow sphere has an outside radius of 1m and is made of polystyrene foam (k=0.033 W/m K) with a thickness of 1.11cm. A heat source inside keeps the inner surface 2.00°C hotter than the outside surface. What is the thermal resistance due to conductivity of the sphere material? Use 4 decimal places

A hollow sphere has an outside radius of 1m and is made of polystyrene foam (k=0.033 W/m K) with a thickness of 1.11cm. A heat source inside keeps the inner surface 2.00°C hotter than the outside surface. What is the thermal resistance due to conductivity of the sphere material? Use 4 decimal places