• Please sit together in pairs: – – – – – – – – – – – – – Onyema and Honglu Alejandra and Sean Chris and Lin Rachel and Anwen John F. and Mengyue Walter and Melissa Max and Zhongyun Matthew and Anna Amanda and Kaijun Pauline and Erich Jacob and Irfan John W. and Michael Jennifer and Jiayuan – – – – Alexandra and Erica Emmanuel and Dian Robert and David Andrew and Shiying Phys 150 Lecture 1 1 Phys 150 – Physics of Societal Issues • Professor Scott Willenbrock – Research interests in particle physics and finance • Teaching Assistant: Mae Hwee Teo • Intended for non-science majors interested in science in today’s world – No background required or assumed – Satisfies the Physical Sciences requirement of the Natural Sciences and Technology requirement of the General Education requirements – Satisfies the Quantitative Reasoning II requirement • Textbook – Physics and Technology for Future Presidents by Richard Muller – DO NOT CONFUSE WITH Physics for Future Presidents by the same author – buy that one for your parents! Phys 150 Lecture 1 2 Other required materials • i>clicker – Register your i>clicker on the Phys 150 web page – Student ID = Net ID = your UIUC email address (Net ID @illinois.edu) – Set i>clicker frequency to BB • A basic calculator – Choose one with scientific notation (EE or EXP button) Phys 150 Lecture 1 3 Why take this course? • Modern science is essential to understanding and solving major societal issues – We will eventually run out of fossil fuels (oil, coal, natural gas). What alternative sources of energy make sense? – Burning fossil fuels emits carbon dioxide. How will this affect the Earth’s climate? – What are the benefits and risks of nuclear energy? What happened at Fukushima? Chernobyl? Three Mile Island? – What are the different kinds of nuclear weapons? Why are they hard to make? – What are the benefits and risks of medical imaging? How dangerous are different kinds of radiation? – What is an earthquake? A tsunami? Where does the Earth’s magnetic field come from? – How do spy satellites work? How about GPS satellites? Weather satellites? Phys 150 Lecture 1 4 How to read the textbook • First reading of Chapter BEFORE coming to lecture – Read like a novel, don’t get hung up on numbers or calculations • Further reading of Chapter for studying material more carefully – Useful for homework • Things that you can ignore: – Footnotes (although they are often interesting) – Sections labeled “Optional” Phys 150 Lecture 1 5 What do I really need to know? • Everything that the author tells you that you need to know – Unnecessary to memorize tables of numbers • Everything that is covered in lecture (unless you are told otherwise) – Lectures contain material supplemental to the textbook • One difference from the textbook: I will teach you how to work with and understand numbers Phys 150 Lecture 1 6 Weekly assignments • Read the Chapter BEFORE coming to Tuesday lecture. – Read like a novel • Quiz (almost) every Tuesday at the beginning of class – Multiple choice questions based on the reading for the week • Homework due the following Sunday at midnight – Multiple choice questions and written-answer questions Phys 150 Lecture 1 7 Exams • Exam 1 – Thursday, February 28, in class – Chapters 1-5 • Exam 2 – Thursday, April 18, in class – Chapters 6-10 • Final Exam – Tuesday, May 7, 7:00-10:00 PM – Chapters 1-10 • Exams will have both multiple-choice and written-answer questions. Phys 150 Lecture 1 8 Grading • 60 pt (max): i>clicker - 3 points per lecture – Starting next Tuesday • 100 points: Quizzes - 10 points each – Starting next Tuesday (Quiz on Chapter 1) • 240 points: Homework – 20 points each – Homework 1 is due Monday at midnight • 300 points: Exams 1 and 2 – 150 points each • 300 points: Final Exam • 1000 points total – A (>900), B (>800), C(>700), D(>600) Phys 150 Lecture 1 9 Turn off all electronic devices • Except for your i>clicker, of course • This includes laptops, smartphones, etc. • Violators will lose their 3 points for lecture participation Phys 150 Lecture 1 10 Chapter 1 – Energy and Power • Chemical energy Phys 150 Lecture 1 Canister 11 Chapter 1 – Energy and Power • Chemical energy Canister 100 Tons TNT Phys 150 Lecture 1 12 i>clicker question Which of these has the LEAST amount of energy per gram? A. B. C. D. TNT Chocolate Chip Cookies Ethanol Hydrogen Phys 150 Lecture 1 13 Energy per gram Compared to TNT • • • • TNT Chocolate chip cookies Ethanol Hydrogen - TNT does not require Oxygen to burn, while the others do Phys 150 Lecture 1 1 8 10 40 Balloon 14 Energy per gram Compared to TNT • • • • TNT Chocolate chip cookies Ethanol Hydrogen 1 8 10 40 - TNT does not require Oxygen to burn, while the others do Balloon Fukushima 2011 Hindenburg 1937 Phys 150 Lecture 1 15 Energy per gram Compared to TNT • • • • • • • • • Car battery Computer battery Chocolate chip cookies Coal Ethanol Gasoline Natural gas (methane) Hydrogen Uranium-235 Phys 150 Lecture 1 0.05 0.15 8 10 10 15 20 40 30 million 16 Explosions Cannon • Rapidly expanding hot gas Phys 150 Lecture 1 17 Explosions Cannon • Rapidly expanding hot gas Comet Shoemaker-Levy 9 1994 Phys 150 Lecture 1 18 Explosions • Kinetic energy = energy of motion = ½ mv2 Extinction of dinosaurs 65 million years ago Phys 150 Lecture 1 19