At a fabrication plant, a hot metal forging has a mass of 67.2 kg and a specific heat capacity of 438 j/(kg c°). to harden it, the forging is quenched by immersion in 786 kg of oil that has a temperature of 37.1 °c and a specific heat capacity of 2950 j/(kg c°). the final temperature of the oil and forging at thermal equilibrium is 58.3 °c.
assuming that heat flows only between the forging and the oil, determine the initial temperature in degrees celsius of the forging.