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ENVS3070/PHYS3070

ENVS3070/PHYS3070. Prof. R.J. Peterson Gamow Tower F1015 (303)492-1686 Jerry.Peterson@Colorado.edu Office Hours MWF 10-12 (extra before exams) Or by appointment, or drop in. All power point images are only for the exclusive use of Phys3070/Envs3070 Spring term 2014. Survey.

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ENVS3070/PHYS3070

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  1. ENVS3070/PHYS3070 Prof. R.J. Peterson Gamow Tower F1015 (303)492-1686 Jerry.Peterson@Colorado.edu Office Hours MWF 10-12 (extra before exams) Or by appointment, or drop in. All power point images are only for the exclusive use of Phys3070/Envs3070 Spring term 2014

  2. Survey Please pick up the anonymous one-page survey on your initial opinions about Energy and the Environment, and return it to me in class Wednesday.

  3. HomeworkEvery Monday, as of Jan. 27, first Wednesday Jan. 22. • Paper assignments, turned in here, before class. Returned by next Friday class session, probably, in classroom boxes. First, Jan. 22. • CAPA (Jan. 27,….), due 0900 • No late HW, after answers covered in class or posted.

  4. Exams • Midterm #1 Monday Feb. 17, in class. • Midterm #2 Friday March 21 ( the Friday before spring break!) • Final

  5. Help Room G2B90 • Your graders/TA’s

  6. Clickers • i>clickers • Register www.colorado.edu/its/cuclickers/students/register.html • Begin Wednesday • 1 point for a wrong answer, 3 points for a correct answer

  7. Course Home Page www.colorado.edu/physics/phys3070/phys3070_sp14 • will hold reading and HW assignments, HW answers (soon after it is due, hence no credit for late HW), exam answers, useful or required links to vital information. • Required add-on reading, on the web. Can be covered on exams, but not in numerical detail

  8. Text • Energy and The Environment, Ristinen and Kraushaar, Second Edition. • Pay special attention to the inside of the front cover. • Additional useful numbers will be distributed. • A lot of newer information will be added, and some reading assignments will be from the web to be up to date.

  9. Exams • Open book!! But no electronics. • You will need the simplest of calculators, to multiply and divide, perhaps take square roots.

  10. Sequence of the course • Energy and why we use it; units--Chapter 1 • Fossil fuel energy—where do we get it ,how much is there? How do we use it? Chapters 2 and 3 • Impacts of that energy--pollution, climate change. Chapters 9 and 10 • What to do about this? more energy, less impact. Chapters 4-8

  11. A Perfect Storm • Population growth • Energy usage per person is increasing • Expectations/growth per person • Declining fossil fuels • Local environmental damage • Global climate change

  12. The hard part of the course-the units of energy! English/metric – pounds and kilograms Those based on work/based on heat-Joules and BTU Special things---MTOE, horsepower Gold standard– the Joule (J), a force of one Newton (N) pushing for one meter. One Newton is about the force you exert when pushing a doorbell. For atoms—electron volt (eV)=1.60 x 10-19 J For nations, the Quad =peta BTU =1O15 BTU Conversion: 1 BTU=1055 J, so 1 Quad=1015BTU * 1055 J/BTU=1.055 *1018 J

  13. An important distinction POWER = RATE of Energy = energy / time One Watt = I Joule / sec Back to energy 1 kW-hr ( power x time) =103 J/sec x 3600 sec = 3.6 x 10 6 J English unit of power = the horse power = 550 ft pounds per sec Energy used by a 100 W bulb in one year 100 J/sec x 3.16x107sec = 3.16x109 J OR=0.10 kW * 8766 hr/year * 1 year=877 kW-hr.

  14. Example How many watts of electrical power can you sell by burning one ton of coal per hour? One ton of coal holds 2.81 x 10 10 J. One hour holds 3600 seconds. Power = energy/ time = J/sec=Watts 2.81 x 10 10 J / 3.600 x 10 3 sec =0.781 x 10 (10 – 3) J/sec= 0.781 x 10 7 W =7.81 MW (enough for about 80,000 100W light bulbs) (but only if you have perfect efficiency at turning coal energy into electrical energy)

  15. So What? Who needs all that energy? Why can’t we do without? Because energyprosperitybetter, healthier lives happier people

  16. The Industrial Revolution • Convert millions of years of solar energy trapped in fossil fuels to heat. • Convert that heat energy into mechanical energy---- forces times motion, • Often, use that motion energy to create electricity

  17. 1 GJ=109 J

  18. Survey form • Please pick up a copy and return it to me Wednesday.

  19. For Wednesday-- • Chapter 1 through 1.5, especially the examples. • Practice questions 1.3, 1.5, 1.7, 1.8 • Just what is energy? How do we measure it? Define it? Name it? How do we translate among the many energy languages?

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