150 tonnes of liquid steel is contained in a refractory lines ladle which is open at the top. The ladle may be considered as cylindrical in shape with internal diameter of 2.5m. The height of the empty space in the ladle above the surface of liquid metal is 2m. Assuming that the heat loss is principally by radiation at the open top. Calculate the rate of temperature drop of molten steel. 5M Given Specific heat of molten steel = 788 JKgK Emissivity of steel surface = 0.5 Temperature of molten steel-1900K