3. A 90 g aluminum calorimeter contains 450 g of water at an equilibrium temperature of 20C. A 160 g piece of metal, initially at 315C, is added to the calorimeter. The final temperature at equilibrium is 32C. Assume there is no external heat exchange. The specific heat capacities of aluminum and water are 910 J/kg K (aluminum) and 4190 J/kg K (water). What is the specific heat capacity of the 160-g piece of metal? A heat-conducting rod 0.90 m long and wrapped in insulation is made of an aluminum section ^