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A copper ball of mass 100 g is at a temperature T. It is dropped in a copper calorimeter of mass 100 g, filled with 170 g of water at room temperature. Subsequently, the temperature of the system is found to be 75 °C. T is given by (Given: room temperature= 30 °C, specific heat of copper = 0.1 cal g^-1C^-1)

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800 °C

885 °C

1250 °C

825 °C

answer is B.

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Detailed Solution

100(0.1)(T-75) = 170(1)(75-30)+100(0.1)(7.5-30)
We get T = 885°C

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