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4. What is Power? Humans: Work, Energy, and Power Power Work and Energy > Power Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics?campaign_content=book_5869_section_65&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=di rect&utm_source=boundless

5. Power implies that energy is transferred, perhaps changing form. Energy transfer can be used to do work, so power is also the rate at which this work is performed. The unit of power is the joule per second (J/s), known as the watt. What is Power? Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-college-physics-4th-giambattista-alan-0071317945-9780071317948/work-and-energy- 6/power-65/what-is-power-309- 6024?campaign_content=book_5869_section_65&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=boun dless Coal-fired Power Plant View on Boundless.com Work and Energy > Power

6. The rate at which the body uses food energy to sustain life and to do different activities is called the metabolic rate, and the corresponding rate when at rest is called the basal metabolic rate (BMR). The energy included in the basal metabolic rate is divided among various systems in the body, with the largest fraction going to the liver and spleen, and the brain coming next. About 75% of food calories are used to sustain basic body functions included in the basal metabolic rate. Work done by a person is sometimes called useful work, which is work done on the outside world, such as lifting weights. The energy consumption of people during various activities can be determined by measuring their oxygen use, because the digestive process is basically one of oxidizing food. Humans: Work, Energy, and Power Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-college-physics-4th-giambattista-alan-0071317945-9780071317948/work-and-energy- 6/power-65/humans-work-energy-and-power-310- 6037?campaign_content=book_5869_section_65&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=boun dless Energy Conversion in Humans View on Boundless.com Work and Energy > Power

7. Free to share, print, make copies and changes. Get yours at www.boundless.com Appendix

8. Key terms basal metabolic rate The amount of energy expended while at rest in a neutrally temperate environment, in the post-absorptive state. power A measure of the rate of doing work or transferring energy. watt In the International System of Units, the derived unit of power; the power of a system in which one joule of energy is transferred per second. Free to share, print, make copies and changes. Get yours at www.boundless.com Work and Energy

9. Coal-fired Power Plant Tremendous amounts of electric power are generated by coal-fired power plants such as this one in China, but an even larger amount of power goes into heat transfer to the surroundings. The large cooling towers here are needed to transfer heat as rapidly as it is produced. The transfer of heat is not unique to coal plants but is an unavoidable consequence of generating electric power from any fuel—nuclear, coal, oil, natural gas, or the like. Free to share, print, make copies and changes. Get yours at www.boundless.com Connexions. "Power." CC BY 3.0 http://cnx.org/content/m42152/latest/ View on Boundless.comCC BY 3.0http://cnx.org/content/m42152/latest/View on Boundless.com Work and Energy

10. Power A brief overview of power in an algebra-based physics course. Free to share, print, make copies and changes. Get yours at www.boundless.com View on Boundless.com Work and Energy

11. Woman Running Up Stairs When this woman runs upstairs starting from rest, she converts the chemical energy originally from food into kinetic energy and gravitational potential energy. Her power output depends on how fast she does this. Free to share, print, make copies and changes. Get yours at www.boundless.com Connexions. "Power." CC BY 3.0 http://cnx.org/content/m42152/latest/ View on Boundless.comCC BY 3.0http://cnx.org/content/m42152/latest/View on Boundless.com Work and Energy

12. Energy Conversion in Humans Energy consumed by humans is converted to work, thermal energy, and stored fat. By far the largest fraction goes to thermal energy, although the fraction varies depending on the type of physical activity. Free to share, print, make copies and changes. Get yours at www.boundless.com Connexions. "Work, Energy, and Power in Humans." CC BY 3.0 http://cnx.org/content/m42153/latest/?collection=col11406/1.7 View on Boundless.comCC BY 3.0http://cnx.org/content/m42153/latest/?collection=col11406/1.7View on Boundless.com Work and Energy

13. Free to share, print, make copies and changes. Get yours at www.boundless.com Work and Energy Power is measured using which of the following units? A) Kilowatts per square meter (kW/m2) B) Megawatts per second (MW/s) C) Joules per second (J/s) D) Joules per meter (J/m)

14. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ Work and Energy Power is measured using which of the following units? A) Kilowatts per square meter (kW/m2) B) Megawatts per second (MW/s) C) Joules per second (J/s) D) Joules per meter (J/m)

15. Free to share, print, make copies and changes. Get yours at www.boundless.com Work and Energy Which of the following is defining of power? (1) Power is the rate at which energy is transferred, used, or transformed, (2) Power is the rate at which work is performed, (3) Power is the amount of energy A) All of these answers B) (1) and (3) C) (1) and (2) D) (1)

16. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ Work and Energy Which of the following is defining of power? (1) Power is the rate at which energy is transferred, used, or transformed, (2) Power is the rate at which work is performed, (3) Power is the amount of energy A) All of these answers B) (1) and (3) C) (1) and (2) D) (1)

17. Free to share, print, make copies and changes. Get yours at www.boundless.com Work and Energy What is the power output of a 20 kg dog that runs up 10 m high flight of stairs in 10 s, starting from rest but having a final speed of 5 m/s? A) 212.5 J/s B) 2125 J/s C) 2250 J/s D) 225 J/s

18. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ Work and Energy What is the power output of a 20 kg dog that runs up 10 m high flight of stairs in 10 s, starting from rest but having a final speed of 5 m/s? A) 212.5 J/s B) 2125 J/s C) 2250 J/s D) 225 J/s

19. Free to share, print, make copies and changes. Get yours at www.boundless.com Work and Energy Which factors directly affect the basal metabolic rate (BMR)? A) All of these answers B) Age and gender C) Total body weight D) Muscle mass

20. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ Work and Energy Which factors directly affect the basal metabolic rate (BMR)? A) All of these answers B) Age and gender C) Total body weight D) Muscle mass

21. Attribution Connexions. "Power." CC BY 3.0 http://cnx.org/content/m42152/latest/CC BY 3.0http://cnx.org/content/m42152/latest/ Wikipedia. "Power (physics)." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Power_(physics)CC BY-SA 3.0http://en.wikipedia.org/wiki/Power_(physics) Connexions. "Power." CC BY 3.0 http://cnx.org/content/m42152/latest/CC BY 3.0http://cnx.org/content/m42152/latest/ Wikipedia. "Power (physics)." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Power_(physics)CC BY-SA 3.0http://en.wikipedia.org/wiki/Power_(physics) Wiktionary. "watt." CC BY-SA 3.0 http://en.wiktionary.org/wiki/wattCC BY-SA 3.0http://en.wiktionary.org/wiki/watt Boundless Learning. "Boundless." CC BY-SA 3.0 http://www.boundless.com//sociology/definition/powerCC BY-SA 3.0http://www.boundless.com//sociology/definition/power Monterey Bay Institute. CC BY http://www.montereyinstitute.org/courses/Introductory%2520Physics%2520I/nroc%2520prototype%2520files/coursestartc.htmlCC BY http://www.montereyinstitute.org/courses/Introductory%2520Physics%2520I/nroc%2520prototype%2520files/coursestartc.html Connexions. "Work, Energy, and Power in Humans." CC BY 3.0 http://cnx.org/content/m42153/latest/?collection=col11406/1.7CC BY 3.0http://cnx.org/content/m42153/latest/?collection=col11406/1.7 Connexions. "Work, Energy, and Power in Humans." CC BY 3.0 http://cnx.org/content/m42153/latest/?collection=col11406/1.7CC BY 3.0http://cnx.org/content/m42153/latest/?collection=col11406/1.7 Connexions. "Work, Energy, and Power in Humans." CC BY 3.0 http://cnx.org/content/m42153/latest/?collection=col11406/1.7CC BY 3.0http://cnx.org/content/m42153/latest/?collection=col11406/1.7 Connexions. "Power." CC BY 3.0 http://cnx.org/content/m42152/latest/CC BY 3.0http://cnx.org/content/m42152/latest/ Connexions. "Power." CC BY 3.0 http://cnx.org/content/m42152/latest/CC BY 3.0http://cnx.org/content/m42152/latest/ Connexions. "Work, Energy, and Power in Humans." CC BY 3.0 http://cnx.org/content/m42153/latest/?collection=col11406/1.7CC BY 3.0http://cnx.org/content/m42153/latest/?collection=col11406/1.7 Wikipedia. "Human power." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Human_powerCC BY-SA 3.0http://en.wikipedia.org/wiki/Human_power Connexions. "Work, Energy, and Power in Humans." CC BY 3.0 http://cnx.org/content/m42153/latest/?collection=col11406/1.7CC BY 3.0http://cnx.org/content/m42153/latest/?collection=col11406/1.7 Connexions. "Work, Energy, and Power in Humans." CC BY 3.0 http://cnx.org/content/m42153/latest/?collection=col11406/1.7CC BY 3.0http://cnx.org/content/m42153/latest/?collection=col11406/1.7 Connexions. "Power." CC BY 3.0 http://cnx.org/content/m42152/latest/CC BY 3.0http://cnx.org/content/m42152/latest/ Free to share, print, make copies and changes. Get yours at www.boundless.com Work and Energy

22. Wiktionary. "basal metabolic rate." CC BY-SA 3.0 http://en.wiktionary.org/wiki/basal+metabolic+rateCC BY-SA 3.0http://en.wiktionary.org/wiki/basal+metabolic+rate OER Commons. License: Other http://www.oercommons.org/courses/human-power/viewLicense: Otherhttp://www.oercommons.org/courses/human-power/view Free to share, print, make copies and changes. Get yours at www.boundless.com Work and Energy