The heat transfer rate due to free convection from a vertical surface, 0.4 m high and 0.6 m wide, to quiescent air that is 20 k colder than the surface is known. What is the ratio of the heat transfer rate for that situation to the rate corresponding to a vertical surface, 0.6 m high and 1 m wide, when the quiescent air is 20 k warmer than the surface? Neglect heat transfer by radiation and any influence of temperature on the relevant thermophysical properties of air. Use the properties of air at 300 k temperature
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