1 / 13

Physics Exam Review Session - Saturday, 4 pm, Room C460

Join the exam review session this afternoon in Room C460 at 4 pm to prepare for the upcoming physics exam. No textbook or notes allowed, but you will be provided with a list of equations and necessary materials. Use your own calculator but do not store extra information in its memory. No time limit, but aim for an average time of 2 hours. Study homework, class notes, and old exams in preparation.

patricac
Download Presentation

Physics Exam Review Session - Saturday, 4 pm, Room C460

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Announcements 9/30/11 • Prayer • About that exam… • Review session this afternoon, 4 pm, room C460 • In Testing Center, Saturday morning until Thursday evening • No textbook, no notes • I will give you a list of equations (but not all equations!), and all constants/conversion factors/materials parameters you need • Can use your own calculator, but you’re on your honor not to store extra stuff in calc. memory • No time limit, but “time goal” is 2 hours avg (took me 33 mins)

  2. More on the exam • What to study? I’d recommend in this order: • Homework • Class notes • Old exams • Book Chris office hours today: 3-4 pm Some more specifics about the exam… xkcd

  3. Waves • Skipping: Oscillations, Ch. 15 • If you don’t recall “simple harmonic motion”, please review on your own. • Starting next lecture: Some sections from Physics Phor Phynatics, Dr. Durfee’s book • Starting lecture after that: Complex numbers • Clicker: Have you seen: eix = cosx + isinx ? A = “have seen” B = “not” C = “maybe, but I can’t remember”

  4. Reading quiz • Which of the following phenomena do NOT exhibit a combination of transverse and longitudinal waves? • sound waves in air • surface water waves • waves in the earth generated by an earthquake

  5. Wave intro: some math • What do these functions look like? • f(x) = x2 • f(x) = (x – 1)2 • Think: What would be an equation for a parabola that moves 1 m to the right every second? • What will this function look like at 0 s? at 1 s? at 2 s? • f(x) = (2x – 6t)2 • What is its “velocity”?

  6. Sinusoidal waves • Nothing special about parabolas… • What does f(x) = cos(x – vt) look like at t = 0? at t = a little later? • Add in “amplitude” • Add in “phase” • How to change spatial period? • What if you want wave to move right-to-left instead of left-to-right? “Wave function”

  7. Wave properties • Definition: oscillating disturbance that transfers energy (but not mass). • Direction of travel • Direction of oscillation: transverse vs longitudinal • Medium • Examples… • Water • Earthquake (P & S) • Sound • Light • Rubber tubing (demo) • Slinky (demo) Wikipedia: “S-wave”

  8. Did you say “Slinky”? • The handing out of the slinkies • We have about 35 • There are 34 students registered for the class

  9. Web demo • http://paws.kettering.edu/~drussell/Demos/waves/wavemotion.html

  10. Wave properties, cont. • Web demo: Stokes’ “Traveling Sine Wave” http://stokes.byu.edu/sinewave_script_flash.html • Wavelength l • meters/wave • Period T • seconds/wave • Frequency ( f = 1/T ) • waves/second • Speed v • m/s v = fl

  11. Wavefunction • Let’s call it “s(x)” for now (because “f” is used for frequency) • What are the units of s? • What does s really represent? • For transverse waves… • For longitudinal waves… • What does s(x) represent?

  12. What’s that funny symbol? The (Linear 1D) Wave Equation • Why is it called the wave equation? • Because traveling waves are solutions of the equation! C = v2 Any function that has “x-vt” will work! …or “x+vt”

  13. k and w • What’s the difference between these: • General form of cosine wave: …sometimes written as: • k = “wavevector”; w = “angular frequency” w = _______

More Related