Chapter 9: Gravitation

Study Plan

With the concepts we will develop in Chapter 9, we can answer various questions about artificial satellites:

  • Communications satellites and weather satellites are placed in high altitude “geosynchronous” orbits that permit them to keep in step with the rotation of the Earth, so the satellite always remains at a fixed point above the equator. What is the radius of such a geosynchronous orbit? (Example 6, page 279; and Physics in Practice: Communications Satellites and Weather Satellites, page 281)
  • Surveillance satellites and spacecraft such as the Space Shuttle usually operate in low-altitude orbits, just above the Earthís atmosphere. How quickly does such a satellite circle the Earth? (Example 7, page 280)
  • The Syncom satellite was carried by the Space Shuttle to a low-altitude orbit, and then it used its own booster rocket to lift itself to the high-altitude geosynchronous orbit. What is the increase of mechanical energy (kinetic and gravitational) of the satellite during this transfer from one orbit to another? (Example 9, page 290)

Organize

  1. Prepare for lecture by reading the assigned sections from Chapter 9 in your textbook or ebook. This will provide an organizing framework for concepts introduced in lecture, and help you take better notes.
  2. Take the checkup quiz and work the Checkup questions in your textbook to assess your understanding of basic concepts. Take note of any topics you need to review further.
  3. Review the Examples from your textbook. These progress from simple to complex, and provide concrete illustrations of the concepts discussed.
  4. Review the Math Help on Ellipses from your textbook.

Learn

  1. Re-read Chapter 9 and review your lecture notes.
  2. Access the Online Concept Tutorials given for this chapter. Tutorials use animation and interactive exercises to help develop your understanding of fundamental topics.
    Circular Orbits
    Sections: 9.1, 9.3
    Keplerís Laws
    Sections: 9.4
  3. Use the FlashCards to test your memory for new key terms and equations.
  4. Work the end of chapter Problems and Review Problems assigned by your instructor. If your instructor has assigned SmartWork online homework, login from the right navigation pane.

Connect

  1. Throughout the text Physics in Practice boxes explore real-world applications of core concepts in specific detail. In Chapter 9 see:
    Concept in Context Physics in Practice: Communication Satellites and Weather Satellites
  2. Physics in the News offers additional real-world physics applications, and a daily dose of science-based news.

Section Menu

Organize

Learn

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