Lecture22 - PHYSICS 149: Lecture 22 Chapter 11: Waves 11.1...

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PHYSICS 149: Lecture 22 • Chapter 11: Waves – 11.1 Waves and Energy Transport – 11.2 Transverse and Longitudinal Waves – 11.3 Speed of Transverse Waves on a String – 11.4 Periodic Waves Lecture 22 Purdue University, Physics 149 1
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Midterm Exam 2 • Wednesday, April 6, 6:30 PM – 7:30 PM • Place: PHY 333 • Chapters 5 - 8 • The exam is closed book. • The exam is a multiple-choice test. • There will be ~15 multiple-choice problems. – Each problem is worth 10 points. • Note that total possible score for the course is 1,000 points (see the course syllabus) • The difficulty level is about the same as the level of textbook problems. • You may make a single crib sheet – you may write on both sides of an 8.5” × 11.0” sheet Lecture 20 2 Purdue University, Physics 149
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ILQ 1 A bolt requires 110 N m of torque to be unscrewed. If the maximum force you can apply is 198 N, what is the shortest wrench you can use to unscrew the bolt? A) 28 cm B) 56 cm C) 1.8 m D) 0.556 cm Lecture 22 3 Purdue University, Physics 149
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ILQ 2 A uniform bar of mass m is supported by a pivot at its top, about which the bar can swing like a pendulum. If a force F is applied perpendicularly to the lower end of the bar as in the diagram, how big must F be in order to hold the bar in equilibrium at an angle from the vertical? A) 2mg B) mg sin θ C) 2mg sin θ D) (mg/2) sin θ E) (mg/2) cos θ Lecture 22 4 Purdue University, Physics 149
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Lecture 22 Purdue University, Physics 149 5 Linear and Angular Linear Angular Displacement x θ Velocity v ω Acceleration a α Inertia mI Kinetic Energy ½ m v 2 ½ I ω 2 Newton s 2 nd Law F = ma τ = I α Momentum p = mv L = I ω
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Lecture 22 Purdue University, Physics 149 6 What is a Wave • A wave is a disturbance that travels away from its source and carries energy. • A wave can transmit energy from one point to another without transporting any matter between the two points. • Examples: – Sound waves (air moves back & forth) – Stadium waves (people move up & down) – Water waves (water moves up & down) – Seismic waves (earth moving up & down) – Light waves (what moves ??)
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Waves • A wave is a disturbance that travels away from its source.
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This note was uploaded on 04/23/2011 for the course PHYS 149 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Lecture22 - PHYSICS 149: Lecture 22 Chapter 11: Waves 11.1...

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