A square plate of glass 1 m2 area and 3 mm thick is heated uniformly to 90 0C initially and later cooled by air having temperature 20 0C and flowing at 2 m/s both sides parallel to glass plate. Calculate the initial rate of cooling the plate in 0C/sec neglecting temperature gradients in the glass plate with density 2500 kg/m3 and specific heat 0.67 KJ/kg0K

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