Lecture_12_(Student_Handoutl)

Lecture_12_(Student_Handoutl) - Phys 172: Modern Mechanics...

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Phys 172: Modern Mechanics Summer 2009 pFt E W Q L t sys sys surr sys net net τ Δ= Δ Δ = + Δ G G GG Lecture 12 – Energy in Macroscopic Systems Read 6.1 – 6.7
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Reading Quiz 1&2
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Energy Graph for Previous Example constant PS P K UB += = r 1 r 2 U 2 U 1 K 1 K 2 As K , U and vice-versa. But total = const. r 3 Note: r 3 is maximum value of r. K+U < 0 system is bound . P SP K BU =
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CLICKER QUESTION #1&2
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Bound Orbits Classically forbidden region Energy r
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Unbounded System: Star + Rocket E r 0 K+U U K rocket •K i large enough for rocket to escape. i > |U i |, so that K+U > 0 • system is unbounded or free : separation r can be arbitrarily large K rocket + U = const during trip, K U
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Bound System: Star + Rocket E r 0 K+U U K rocket • system is bound : separation r has upper limit K rocket + U = const during trip, K U rocket comes to a stop here
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“Potential Wells (or debt)” E r 0 K+U < 0 U System starts out “in a hole” or a “well” since U<0 is “below ground level” Bound : rocket doesn’t have enough K i to climb out of the “potential well” r 0 K+U > 0 U K i K i Free or unbounded : rocket has enough K i to climb out of the “potential well”
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Spring Potential Energy Today: Energy in Macroscopic Systems Energy In Atomic Bonds Thermal Energy and Specific Heat
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10 Energy diagrams x U
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This note was uploaded on 09/14/2009 for the course ENGR 126 taught by Professor Oakes during the Fall '08 term at Purdue University.

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Lecture_12_(Student_Handoutl) - Phys 172: Modern Mechanics...

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