W5.2 - Physics for Scientists Engineers 1 Spring Semester...

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February 5, 2008 1 Engineers 1 Engineers 1 Spring Semester 2008 Lecture 17
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February 5, 2008 2 Midterm Exam 1 Midterm Exam 1 Next Monday (February 11), we will have our first midterm exam in class All questions will be multiple choice The exam will cover chapters 1 -5, homework sets 1-5, and all the lectures through Friday You need to bring A calculator A No. 2 pencil to fill out the scantron form 1 sheet of size 8.5 x 11 in., with equations (“cheat sheet”) Nothing else There will be a chart showing you which row to sit in by alphabetical order
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February 5, 2008 3 Energy, Work, Power Energy, Work, Power What we will learn today and this week: • Kinetic energy is the energy contained in the motion of an object. • Work is defined as energy transferred to an object or transferred from an object due to the action of a force. Positive work is defined as a transfer of energy to the object, and negative work is a transfer of energy from the object. Positive work is work done on the object, while negative work is work done by the object. • Work is the scalar product of the force vector and the displacement vector. • The change in kinetic energy due to a force is equal to the work done by the force. • Power is the rate at which work is done
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February 5, 2008 4 Energy, the BIG PICTURE Energy, the BIG PICTURE
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February 5, 2008 5 Energy in our Economy Energy in our Economy Energy production Energy consumption Energy efficiency Energy resources National and global energy policy Needs informed citizens to join discussion
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February 5, 2008 6 Energy from Fossil Fuels Energy from Fossil Fuels Fossil fuels Coal Oil Natural gas Basic chemical composition: Hydrocarbons Burning hydrocarbons with oxygen releases energy -> useful for power production on a very large scale Basis for most of our chemical industry as well Problems: Non-renewable resource Pollution: carbon dioxide emission: acid rain, global warming
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February 5, 2008 7 Solar farm in CA http://kjcsolar.com/aerial1.jpg Solar Power Solar Power
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This note was uploaded on 04/06/2008 for the course PHY 183 taught by Professor Wolf during the Spring '08 term at Michigan State University.

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W5.2 - Physics for Scientists Engineers 1 Spring Semester...

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