Chapter 11
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© 2010 Pearson Education, Inc. PowerPoint ® Lectures for College Physics: A Strategic Approach, Second Edition Chapter 11 Using Energy
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Chapter 11. 0. Using Energy. Slide 11-3. Slide 11-4. Slide 11-5. Efficiency. Slide 11-13. Reading Quiz. A machine uses 1000 J of electric energy to raise a heavy mass, increasing its potential energy by 300 J. What is the efficiency of this process? 100% 85% 70% 35% 30%. Slide 11-6. - PowerPoint PPT Presentation
Transcript of Chapter 11
© 2010 Pearson Education, Inc.
PowerPoint® Lectures forCollege Physics: A Strategic Approach, Second Edition
Chapter 11
Using Energy
© 2010 Pearson Education, Inc. Slide 11-3
© 2010 Pearson Education, Inc. Slide 11-4
© 2010 Pearson Education, Inc. Slide 11-5
© 2010 Pearson Education, Inc.
Efficiency
Slide 11-13
© 2010 Pearson Education, Inc.
Reading Quiz 1. A machine uses 1000 J of electric energy to raise a heavy
mass, increasing its potential energy by 300 J. What is the efficiency of this process?
A. 100%B. 85%C. 70%D. 35%E. 30%
Slide 11-6
© 2010 Pearson Education, Inc.
Answer1. A machine uses 1000 J of electric energy to raise a heavy
mass, increasing its potential energy by 300 J. What is the efficiency of this process?
A. 100%B. 85%C. 70%D. 35%E. 30%
Slide 11-7
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Example ProblemLight bulbs are rated by the power that they consume, not the light that they emit. A 100 W incandescent bulb emits approximately 4 W of visible light. What is the efficiency of the bulb?
Slide 11-12
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The Ideal Gas Model
avg
B
2
3
KT
k
Slide 11-18
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Rank the following temperatures, from highest to lowest.
A. 300 °C > 300 K > 300 °F
B. 300 K > 300 °C > 300 °F
C. 300 °F > 300 °C > 300 K
D. 300 °C > 300 °F > 300 K
Checking Understanding:Temperature Scales
Slide 11-19
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Rank the following temperatures, from highest to lowest.
A. 300 °C > 300 K > 300 °F
B. 300 K > 300 °C > 300 °F
C. 300 °F > 300 °C > 300 K
D. 300 °C > 300 °F > 300 K
Answer
Slide 11-20
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What is Heat??
Energy transferred between 2 objects at different temperatures.
Always flows from hot to cold
Zeroth Law of Thermodynamics:
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How to increase the thermal (internal) energy of the water?
© 2010 Pearson Education, Inc. Slide 11-23
U = W + Q
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First Law of Thermodynamics
U = Q + W
+Q…heat flows into system
-Q…heat flows out of system
+W…Work done ON System
-W…Work done BY system
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Operation of a Heat Engine
Slide 11-26
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The Theoretical Maximum Efficiency of aHeat Engine
Slide 11-27
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Operation of a Heat Pump
Slide 11-29
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Second Law of Thermodynamics
Slide 11-34
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Summary
Slide 11-37
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Summary
Slide 11-38
