College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 15

A student doing an experiment pours 0.150 kg of heated copper shot into a 0.375-kg aluminum calorimeter cup containing 0.200 kg of water. The cup and water are both initially at 25 °C. The mixture (and the cup) comes to thermal equilibrium at 28 °C. What was the initial temperature of the shot