3. +-/1 points OSColPhys2016 14.2.WA.011 My Notes You pour 170 g hot coffee at 7

Question

3. +-/1 points OSColPhys2016 14.2.WA.011 My Notes You pour 170 g hot coffee at 78.7°C and some cold cream at 7.50°C to a 115-g cup that is initially at a temperature of 22.0°C. The cup, coffee, and creanm reach an equilibrium temperature of 62.0°C. The material of the cup has a specific heat of 0.2604 kcal/(kg·°C) and the specific heat of both the coffee and cream is 1.00 kcal/(kg·C). If no heat is lost to the surroundings or gained from the surroundings, how much cream did you add? 9 Additional Materials Reading

Explanation / Answer

Q coffee + Q cream + Q cup = 0

170*1*(62-78.7) + m*1*(62-7.5) + 115*0.2604*(62-22) = 0

-2839 + 54.5m + 1197.4 = 0

m=30.13 g

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