An artist working on a piece of metal in his forging studio plunges the hot metal into oil in order to harden it. the metal piece has a mass of 54 kg and its specific heat is 0.1027 kcal/(kg · °c). he uses 810 kg of oil at 35°c. the specific heat of oil is 0.7167 kcal/(kg · °c). once the metal is immersed in the oil, the temperature reaches an equilibrium value of 39°c. how hot was the forged metal piece just before he plunged it into the oil?