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Water of mass 200 g and temperature 30^(...

Water of mass 200 g and temperature `30^(@)C ` is taken in a copper calorimeter of mass 50g and temperature `30^(@)C` . A copper sphere of mass 100g and temperature `100^(@)C ` is released into it. What will be the maximum temperature of the mixture ? [ c ( water = ` 1 cal //g.^(@) C `, c ( copper ) = `0.1 cal//g.^(@)C `]

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The correct Answer is:
`33.26^(@)C `
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