Chapter 14 review

    Standardized test practice
    1. Which of the following is not an example of harmonic motion?
      1. a ball rolling down a hill
      2. pistons in a running car engine
      3. a swinging pendulum
      4. waves in a pond spreading outward from a stone that was dropped

    2. What is the period of a wave that has a frequency of 10 Hz?
      1. (v/10) s
      2. (10/c) s
      3. 0.1 s
      4. 10v s

    3. Which is not an example of stable equilibrium?
      1. a small mass suspended vertically from a spring
      2. a ball at the top of a hill
      3. a marble at the bottom of an empty bowl
      4. a pendulum at rest

    4. Planet X orbits Black Hole Y every 2,000 yr. In revolutions per year, what is the frequency of Planet X’s orbit?
      1. 10−6 rev/yr
      2. 5×10−4 rev/yr
      3. 5 rev/yr
      4. 2×103 rev/yr

    5. Two physical systems that can oscillate are (1) an object hanging from a string or wire (i.e., a pendulum) and (2) an object attached to a spring. Any such object has a specific natural frequency. Which of these systems changes its natural frequency when the object’s mass changes?
      1. both
      2. neither
      3. only the pendulum
      4. only the spring system

    6. Which of the following is an example of resonance?
      1. a pendulum swinging back and forth
      2. a small mass vertically suspended from a spring
      3. the flickering of a fluorescent light
      4. the musical note “B flat” played on a trumpet

    7. Which is the best choice of equipment to measure the period of oscillation of a pendulum?
      1. your heartbeat
      2. meter stick
      3. triple beam balance
      4. stopwatch

    1. The highest and lowest points of a mass oscillating on a spring are 20 cm apart. What is the amplitude of the movement?
      1. 10 cm
      2. 20 cm
      3. 30 cm
      4. 40 cm

    2. Which is not an example of the natural frequency of a system?
      1. an electric motor spinning at 10 Hz
      2. a pendulum swinging at 2 Hz
      3. a mass on a spring oscillating at 4.7 Hz
      4. a boy on a swing going back and forth at 0.3 Hz

    3. When constructing the support for a simple pendulum, which is the best choice for how to attach the pendulum’s string to the stand?
      1. Attach the string to the stand using duct tape.
      2. Attach the string to the stand using wood glue.
      3. Clamp the string to a pin in the stand.
      4. Tie a loop of string around the pin in the stand.

      4. Three pendulums oscillating at 0.75 Hz, 0.97 Hz, and 1.25 Hz
    4. Three pendulums are shown here, each labeled with its natural frequency. Which statement best describes the relationship between pendulum length and pendulum period?
      1. The greater the length, the greater the period.
      2. The greater the length, the lesser the period.
      3. Length is independent of period.
      4. One cannot tell from the information provided.

      5. Position versus time graph for an oscillating mass
    5. The position of an oscillating mass is graphed here as a function of time. Which quantity is changing as time passes?
      1. period
      2. frequency
      3. amplitude
      4. none of the above

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