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A circular disc of diameter 20 cm and thickness 5 cm is hanging from the ceiling of a room. If the ambient temperature inside the

A circular disc of diameter 20 cm and thickness 5 cm is hanging from the ceiling of a room. If the ambient temperature inside the room is 20°C and the disc temperature is 75°C, then the rate of cooling due to convection is _________________ W
Take heat transfer coefficient as 2 W ∙ m−2 ∙ K−1

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