Post Lab 11 - be steeper because the rate of vaporization would be greater due to the increased surface area available for heat to be transferred

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Post Lab 11 1. It started to drop because the water was giving up thermal energy to the aluminum cylinder. It flowed from the water to the aluminum cylinder. It started to rise because the aluminum+water system is at a lower temperature than the surroundings Heat is transferred from the surroundings into the aluminum+water container. 2. The final temperature would be the same. The freezing and re-melting of the water does not affect the overall heat transfer process between the water and the aluminum cylinder. 3. The slope of the linear parts of the graph from the first experiment shows the rate of vaporization of the liquid nitrogen. If the mouth of the cup was wider, the slope would
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Unformatted text preview: be steeper, because the rate of vaporization would be greater, due to the increased surface area available for heat to be transferred into the system. 4. 5. The specific heat capacity of copper is 385 J/kg ºC, which is about 43% of the specific heat capacity of aluminum (900 J/kg ºC). Assuming equal masses, the liquid nitrogen vaporized when using copper would be about 43% of the amount vaporized when using aluminum. When the copper is placed in water, the final temperature will be warmer than with aluminum. This is because it takes less heat to raise the temperature of copper 1ºC than to raise aluminum 1ºC....
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This note was uploaded on 11/29/2011 for the course PHY 102M taught by Professor Staff during the Fall '08 term at University of Texas at Austin.

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