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Lect07

# Lect07 - PHYS 172 Modern Mechanics Spring 2012 EXAM 1 is...

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Spring 2012 PHYS 172: Modern Mechanics EXAM 1 is next week Time: 8:00-9:30 pm Wed Feb 8 Place: Elliott Hall Material: lectures 1-8, HW 1-8, Recitations 1-4, Labs 1-4 Lecture 7 – Speed of Sound in a Solid, Buoyancy Read 4.9 – 4.13 1 Problems: multiple choice, 10 questions (70 points) write-up part, hand graded (30 points) Equation sheet: provided with exam Practice exam + equation sheet: will be posted at the end of this week Note: no lecture on Thursday Feb 9!

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Speed of sound in solids s k m ϖ = Qualitatively: Larger ϖ , larger v Larger d , larger v Detailed derivation: v d ϖ = Speed of sound in a solid 2
Derivative form of the Momentum Principle The Momentum Principle ° p = ° F net t ° p t = ° F net The rate of the momentum change is equal to force Works only if force is constant during t d ° p ° p If force changes introduce instantaneous rate of change: dt lim t 0 t The momentum principle d ° p dt = ° F net 3

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Newton s Second Law d ° p dt = ° F net Assume nonrelativistic case : ° p = m ° v Newton s original formulation :
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Lect07 - PHYS 172 Modern Mechanics Spring 2012 EXAM 1 is...

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