lecture_Jan13_betterworkupload

lecture_Jan13_betterworkupload - Announcements: If you have...

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Announcements: If you have urgent communication, only those message sent to ener1810@yorku.ca will receive a reply. Math aid is available in NATS – check the site on Lecture 1 slides Today, Teaching assistant Hiro Sato will talk about the research project guidelines and expectation on writing. How to research the project was covered by John Dupuis, Head Librarian, Steacie Science Library. As stated several times, CHOOSE ONE OF THE TOPICS LISTED. No you cannot write a report on a different topic. To accommodate the fact that you have new material requiring some problem solving, and to help prepare for the first test, Assignment #1 will be posted on Friday on moodle on January 15 th . This is due in hard copy and posted on moodle 1 week later, on January 22 nd, 2010. Next tutorial will be held JAN 25 th during the regular class slot, after the lecture. Check location in class after lecture.
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date for handing back Assignment Likely date for in-class exam Date for submitting Research project Possible date for tutorial in class date to hand out Assignment
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http://www.physicsclassroom.com/mmedia/energy/pe.cfm http://adventure.howstuffworks.com/roller-coaster3.htm entertainment.howstuffworks.com/pole-vault3.htm
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The Energy of Heat Hot things have more energy than their cold counterparts Heat is really just kinetic energy on microscopic scales: the vibration or otherwise fast motion of individual atoms/molecules Even though it’s kinetic energy, it’s hard to derive the same useful work out of it because the motions are random Heat is frequently quantified by calories (or Btu) One calorie (4.184 J) raises one gram of water by 1ºC One Calorie (4184 J) raises one kilogram of water 1ºC One Btu (1055 J) raises one pound of water by 1ºF 1 Food Calories = 1000 Cal = 1 kilocalorie
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We can see examples of heat energy producing other types of energy Air over a hot car roof - gaining kinetic energy That same air also gains gravitational potential energy All of our wind is driven by temperature differences Electricity generation depends on temperature differences : no steam would circulate if everything was at the same temperature Conversion from Heat to Work
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We have two practical objectives here First is to learn enough thermodynamic principles to appreciate the reasons for low efficiency for commercial steam turbines Use these principles to understand the methods being used to dispose of heat in environmentally unacceptable ways.
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cooling of buildings. An average of 50% of this energy is used for space heating Increased efficiency in the use of energy should be the highest priority. Remember: 1 quad
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This note was uploaded on 06/07/2010 for the course NATS 1810 taught by Professor Sampabhadra during the Winter '10 term at York University.

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lecture_Jan13_betterworkupload - Announcements: If you have...

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