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A hot body is placed in cooler surroundings. When the body temperature is 75°C, the rate of cooling is 4°C/ min. When it is 55°C, the rate of cooling is 2°C/ min. The temperature of the surroundings is
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Correct option is D
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A calorimeter of mass 0.2 kg and specific heat 900 Containing 0.5 kg of a liquid of specific heat 2400J/kg/K. Its temperature falls from
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