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Unformatted text preview: ISP209s8 Lecture 7-1- Today Announcements: HW#4 is due by 8:00 am Wednesday February 14th. The second and third extra credit assignments are open and are due in two weeks at 8:00 am on Feb 13 th Exam #1 is next week on Thursday, there is an important review lecture on Tuesday General Relativity ISP209s8 Lecture 7-2- Something to tell your friends about 2 Newtons second law of force tell us that ISP209s8 Lecture 7-3- Picture The following is a picture of a chemical reaction: Start with some initial mass (kg) Something happens End up with some final mass (kg) f- see the table on the next page Some fraction, f, is converted to energy ENERGY (Joules, J) The amount of energy is E = m converted c 2 m converted = (Mass to start) x fraction ISP209s8 Lecture 7-4- Fraction of Energy Converted In a chemical reaction not all the mass can be converted to energy. Actually only a very small fraction (the exact value of the fraction depends on the chemical reaction). Compressing a spring 1x10-15 Mechanical Burning coal 1x10-10 Chemical Nuclear power plant 0.001 Fission Power source of the Sun 0.007 Fusion No common example; happens at particle accelerators 1 Matter-Antimatter Annihilation Example Fraction Reaction ISP209s8 Lecture 7-5- Some Samples A power plant generates 500 MW of electrical power and 700 MW of waste heat (plants always make more waste heat than electrical power). How many Joules of energy does the plant generate in 1 day? Data: 1 Watt = 1 Joule/s d...
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This note was uploaded on 07/25/2008 for the course ISP 209 taught by Professor Sherrill during the Spring '07 term at Michigan State University.
- Spring '07