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23 Nov 2019

1. Suppose0.0290 kg of steam (at 100.00°C) is added to 0.290 kg of water(initially at 19.1°C.). The water is inside a copper cup of mass27.3 g. The cup is inside a perfectly insulated calorimetrycontainer that prevents heat flow with the outside environment.Find the final temperature (in °C) of the water after equilibriumis reached.

2. A coppersheet of thickness 2.25 mm is bonded to a steel sheet of thickness1.29 mm. The outside surface of the copper sheet is held at atemperature of 100.0°C and the steel sheet at 26.1°C.

a)Determine the temperature (in °C) of the copper-steelinterface.

b) How muchheat is conducted through 1.00 m2 of the combined sheets persecond?

3. Fora class demonstration, your physics instructor pours 1.18 kg ofsteam at 100.0°C over 4.81 kg of ice at 0.0°C and allows the systemto reach equilibrium. He is then going to measure the temperatureof the system. While the system reaches equilibrium, you are giventhe latent heats of ice and steam and the specific heat of water:Lice = 3.33·105 J/kg,Lsteam =2.26·106 J/kg, cwater =4186 J/(kg °C). You are asked to calculate the final equilibriumtemperature (in °C) of the system. What value do youfind?

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