EvCC PHYS 122 - Week 4 Lesson (13 pages)

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Week 4 Lesson



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Week 4 Lesson

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Lecture Notes


Pages:
13
School:
Everett Community College
Course:
Phys 122 - TWTh

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Week 4 1 QuickTime and a TIFF Uncompressed decompressor are needed to see this picture Week 4 2 Week 4 3 It s 5oC and about 1 atm outside today If you wanted to make water vapor how would you do it Week 4 4 There are some hot air balloons that can reach near space altitudes If you take a glass of water up with you in one of these balloons what will happen Assume the temperature doesn t change much on the ascent Week 4 5 Week 4 6 Assuming you don t have to change the temperature which takes more energy vaporizing water or vaporizing lead Week 4 7 Why does sweating cool you down Week 4 QuickTime and a TIFF Uncompressed decompressor are needed to see this picture 8 The maximum amount of water an adult in temperate climates can perspire in one hour is typically 1 8 L However after several weeks in a tropical climate the body can adapt increasing the maximum perspiration rate to 3 5 L hr At what rate is energy being removed when perspiring that rapidly Assume all of the perspired water evaporates At body temperature Lv 24x105J kg for water QuickTime and a TIFF Uncompressed decompressor are needed to see this picture Week 4 9 How much heat do you need to remove to make 1 kg of nitrogen from the air into liquid nitrogen QuickTime and a TIFF Uncompressed decompressor are needed to see this picture cnitrogen gas 1040 J kg K Week 4 10 Week 4 11 LAB 4 OBJECTIVES To understand phase changes as processes in which energy is transferred to a system without the temperature increasing and to understand the concept of latent heat To determine the latent heats of fusion and vaporization of water To understand the meaning of internal energy of a system To understand the energy balance of a system between heat energy transfer work done and changes in the internal energy as described by the first law of thermodynamics Week 4 12 You put a block of frozen soup into a pot on the stove The stove transfers heat to your soup at a constant rate until it has not only thawed but heated to the



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