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Question 11 of 15 < > -/4 E View Policies Current Attempt in Progress At a fabrication plant, a hot metal forging has a mass of 62.7 kg and a specific heat capacity of 445 J/(kg C°). To harden it. the forging is quenched by immersion in 714 kg of oil that has a temperature of 27.9 °C and a specific heat capacity of 2980 J/(kg C°). The final temperature of the oil and forging at thermal equilibrium is 48.9 °C. Assuming that heat flows only between the forging and the oil, determine the initial temperature in degrees Celsius of the forging. Number i Units 11

Question 12 of 15 -/4 E View Policies Current Attempt in Progress A 0.232-kg coffee mug is made from a material that has a specific heat capacity of 962 J/kg C° and contains 0.316 kg of water. The cup and water are at 28.7 °C. To make a cup of coffee, a small electric heater is immersed in the water and brings it to a boil in two minutes. Assume that the cup and water always have the same temperature and determine the minimum power rating of this heater. Number Units

Question 13 of 15 < > -/4 E View Policies Current Attempt in Progress How much heat in joules must be added to 0.714 kg of aluminum to change it from a solid at 135 °C to a liquid at 660 °C (its melting point)? The latent heat of fusion for aluminum is 4.0 x 105 J/kg. Number Units ***

Question 14 of 15 < > -/4 View Policies Current Attempt in Progress Find the mass of water that vaporizes when 3.10 kg of mercury at 202 °C is added to 0.206 kg of water at 90.6 °C. Number Units

Question 15 of 15 < -/4 E View Policies Current Attempt in Progress Water at 26.0°C is sprayed onto 0.189 kg of molten gold at 1063 °C (its melting point). The water boils away, forming steam at 100.0 °C and leaving solid gold at 1063 °C. What is the minimum mass of water that must be used? mw