posted by Anna .
At a fabrication plant, a hot metal forging has a mass of 74 kg and a specific heat capacity of 430 J/(kg·C°). To harden it, the forging is quenched by immersion in 710 kg of oil that has a temperature of 32°C and a specific heat capacity of 3000 J/(kg·C°). The final temperature of the oil and forging at thermal equilibrium is 47°C. Assuming that heat flows only between the forging and the oil, determine the initial temperature of the forging.