A calorimeter has a thermal capacity of 0.3 kJ/K. 3 litres of water at a temperature 
is poured inside the calorimeter and 2 kg of a piece of copper heated to a temperature 
is dropped in the water. When thermal equilibrium is established, the final temperature of the mixture is 
. What is the initial temperature of the copper piece? The specific heat capacity of water is 4200 J/kg K and that of copper is 385 J/kg K.
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