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PHY138 – Waves, Lecture 2

PHY138 – Waves, Lecture 2. “Physics is like sex: sure, it may give some practical results, but that’s not why we do it.” - Richard Feynman, Nobel Laureate. Reading Assignment.

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PHY138 – Waves, Lecture 2

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  1. PHY138 – Waves, Lecture 2 “Physics is like sex: sure, it may give some practical results, but that’s not why we do it.” - Richard Feynman, Nobel Laureate

  2. Reading Assignment • Please read the following from Serway and Jewett before class on Monday: Chapter 13, up to and including Section 13.5 • A www.masteringphysics.com problem set on Chapter 12 is due on Friday at 5:00PM

  3. Last day’s lecture: some comments • S.H.M. is not constant acceleration, or constant force – both vary with time. • S.H.M. results when restoring force is proportional to displacement. Other types of oscillatory motion are possible, but not discussed in this course. • Angular frequency ω= 2π/T, where T=period. (T = 2π/ω) • “frequency” f = 1/T (in Hertz)

  4. PHY138 – Waves, Lecture 2Today’s overview • Energy in S.H.M. • The Simple Pendulum • Resonance • Waves Introduction, Chapter 13

  5. Interesting points in S.H.M. When x=A cos (ωt) (phase constant=0) K = kinetic energy, U = potential energy

  6. Quiz • An object hangs motionless from a spring. When the object is pulled down, the sum of the elastic potential energy of the spring and the gravitational potential of the object • 1. increases. • 2. stays the same. • 3. decreases.

  7. Mass on Spring versus Pendulum

  8. Transverse Wave Motion:

  9. Longitudinal Wave Motion Compressed Compressed Stretched Stretched

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