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A copper block of unknown mass at 9 0 degree C is put into an insulated tank containing 0 . 0 5 m ^ 3
A copper block of unknown mass at degree C is put into an insulated tank containing m of water at degree C A paddle mixer, driven by a W motor, is started at the same time to stir the water. Thermal equilibrium is established after quarter of an hour, the final temperature being degree C Determine the mass of the copper block. Answer: kg
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