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Revision Question [Total: 41 Marks] A spherical solid of external diameter 0.5m, made of hard rubber, and thickness 0.10m is hanging in a large room with walls, ceiling and floor at a temperature of 290K. It is covered with a 0.05m thick soft rubber layer. Heat is generated in the core, which results in a temperature of 350K on the outer surface of the soft rubber. Air, which is at a temperature of 300K, moves over the outer soft rubber surface at a velocity of 1m/s. 2.1. Calculate the heat transfer coefficient in Wm2K1 of the air film around the composite sphere.[15] 2.2. Calculate q through the composite spherical solid from a heat balance around the outer surface of the composite solid at temperature B. Assume all black body surfaces. [14] 2.3. Calculate the thermal resistance of the hard rubber. [7] 2.4. Calculate temperature C at the inner surface of the hard rubber. [5]