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An aluminum piece of 2.5kg (Specific heat: 900J/kgC) at 115C is dropped into 1.5 kg of...

An aluminum piece of 2.5kg (Specific heat: 900J/kgC) at 115C is dropped into 1.5 kg of water (Specific heat: 4.19x10^3 J/kgC) at 20C.The water covers totally the aluminum piece and in a few minutes the system gets the equilibrium temperature. Calculate this temperature.
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