2) A 100-g block of copper at -30°C is placed in an insulated container holding 250 ml of water at 1°C. Specific heat at constant pressure for water, copper and ice: cw=4.186 kJ/(kgK) c.=0.386 kJ/(kgK), c=2.093kJ/kg. Latent heat of fusion for water L=333 kJ/kg. Everything happens at 1 atm. a) If we assume that none of the water freezes and balance energy, we find a final temperature <0°C. Is this possible? b) If we assume that all of the water freezes and balance energy, we find a final temperature >0°C. Is this possible? c) Actually, only some of the water freezes. What is the final temperature of the system? d) How much water actually freezes?
2) A 100-g block of copper at -30°C is placed in an insulated container holding 250 ml of water at 1°C. Specific heat at constant pressure for water, copper and ice: cw=4.186 kJ/(kgK) c.=0.386 kJ/(kgK), c=2.093kJ/kg. Latent heat of fusion for water L=333 kJ/kg. Everything happens at 1 atm. a) If we assume that none of the water freezes and balance energy, we find a final temperature <0°C. Is this possible? b) If we assume that all of the water freezes and balance energy, we find a final temperature >0°C. Is this possible? c) Actually, only some of the water freezes. What is the final temperature of the system? d) How much water actually freezes?
College Physics
10th Edition
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter10: Thermal Physics
Section: Chapter Questions
Problem 7WUE: One way to cool a gas is to let it expand. When a certain gas under a pressure of 5.00 106 Ha at...
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