AP students should look over the following; (They are not live links so you'll have to copy and paste into your browser.)
The first one describes how to find the angular speed of a planet and the period of rotation.
1) http://h1.ripway.com/DrCherdack/planetsorSatellitesinOrbit.doc
The second one is a series of exercises to help you understand the relationship between frequency, angular speed, and period and how the force of gravity changes when mass or distance changes.
2)http://h1.ripway.com/DrCherdack/gravandrotvariablereviewsheet.doc
The third is an excel workbook. The "planet data form" spread sheet lists the planets, their distance from the sun; their masses; and asks you to find the force of gravity and orbit parameters. The "planet data" spreadsheet has the results http://h1.ripway.com/DrCherdack/SolarSystem.xls
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