An artist working on a piece of metal in his forging studioplunges the hot metal into oil in order to harden it. The metalpiece has a mass of 70 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 is0.7167 kcal/(kg · °C). Once the metal is immersed in the oil, thetemperature reaches an equilibrium value of 40°C. How hot was theforged metal piece just before he plunged it into the oil?

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Thermal equilibrium requires that heat loss by hotter objects ... View the full answer