Lect12 - Fall 2011 PHYS 172: Modern Mechanics Lecture 12...

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Unformatted text preview: Fall 2011 PHYS 172: Modern Mechanics Lecture 12 The Energy Principle Read 6.15 6.17, 7.1 7.2 1 Announcements October Break is M,T Oct. 10, 11. No lecture or labs that week. You Do have recitation that week. EXAM II is Tuesday, Oct. 18, 8-9 pm in Elliott Hall 2 TODAY Review: potential wells Mass and Energy Mass of a Multiparticle System Binding Energy Energy of a Mass-Spring System 3 Review: Potential Wells E r 0 E < 0 U System starts out l in a hole z or a l well z since U<0 Bound : rocket doesn ` t have enough K i to climb out of the l potential well z r 0 E > 0 U K i K i Free or unbounded : rocket has enough K i to climb out of the l potential well z 4 Potential Energy for System of 2 Neutral Atoms r U r 0 unbounded: E > 0 bound: E < 0 Potential Energy for System of 2 Neutral Atoms r U r 0 unbounded: E > 0 bound: E < 0 5 Mass and Energy Example : electron and positron (antielectron) annihilation: 0.511 MeV E = neutron electron proton antineutrino Example : neutron decay Mass of products < mass of neutron! Mass of products < mass of neutron!...
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This note was uploaded on 12/07/2011 for the course PHYS 172 taught by Professor ? during the Fall '08 term at Purdue University-West Lafayette.

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Lect12 - Fall 2011 PHYS 172: Modern Mechanics Lecture 12...

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