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Chapter 11

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.

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Chapter 11

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  1. Chapter 11 0 Using Energy

  2. Slide 11-3

  3. Slide 11-4

  4. Slide 11-5

  5. Efficiency Slide 11-13

  6. 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

  7. Answer • 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 11-7

  8. Example Problem Light 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

  9. The Ideal Gas Model Slide 11-18

  10. Checking Understanding:Temperature Scales • Rank the following temperatures, from highest to lowest. • 300 °C > 300 K > 300 °F • 300 K > 300 °C > 300 °F • 300 °F > 300 °C > 300 K • 300 °C > 300 °F > 300 K Slide 11-19

  11. Answer • Rank the following temperatures, from highest to lowest. • 300 °C > 300 K > 300 °F • 300 K > 300 °C > 300 °F • 300 °F > 300 °C > 300 K • 300 °C > 300 °F > 300 K Slide 11-20

  12. What is Heat?? • Energy transferred between 2 objects at different temperatures. • Always flows from hot to cold • Zeroth Law of Thermodynamics:

  13. How to increase the thermal (internal) energy of the water?

  14. DU = W + Q Slide 11-23

  15. First Law of Thermodynamics • DU = Q + W • +Q…heat flows into system • -Q…heat flows out of system • +W…Work done ON System • -W…Work done BY system

  16. Operation of a Heat Engine Slide 11-26

  17. The Theoretical Maximum Efficiency of a Heat Engine Slide 11-27

  18. Operation of a Heat Pump Slide 11-29

  19. Second Law of Thermodynamics Slide 11-34

  20. Summary Slide 11-37

  21. Summary Slide 11-38

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