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Lecture 8 - Physics 040B/001-S08 Review Chap 15:1-5...

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April 29, 2008 Physics 40B Lecture 8 1 Physics 040B/001-S08 Chap. 15:1-5 Periodic Mechanical Waves Review Continuity Equation for Streamline flow of incompressible fluids: A 1 v 1 = A 2 v 2 Volume Flow Rate (m 3 /s) = A v At any two points along streamline p 1 + " gy 1 + 1 2 " v 1 2 = p 2 + " gy 2 + 1 2 " v 2 2 or p + " gy + 1 2 " v 2 = constant along streamline Bernoulli’s Equation:
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April 29, 2008 Physics 40B Lecture 8 2 Mechanical Waves Waves as means of propagation of energy and momentum without propagation of matter Requires medium to propagate in which has restoring force and inertial mass Electromagnetic waves are different; propagate in vacuum Examples of Mechanical Waves Water waves Seismic Waves Sound Waves Waves on wire, rope, spring, in solids Moving or traveling waves are propagating disturbances (“wiggles”) in medium
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April 29, 2008 Physics 40B Lecture 8 3 Types of Waves Transverse (in solids): Matter moves perpendicular to propagation direction (crests & troughs) Longitudinal (in fluids/solids): Matter moves parallel to propagation direction (compression & rarefication) Surface Waves in Liquid: transverse & longitudinal motion of particles Have definite velocity (speed) of propagation that depends on medium
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