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Homework Help: Universal Gravitation and/or Tidal Forces?

  1. Dec 3, 2016 #1
    1. The problem statement, all variables and given/known data
    The single moon of an Earth-like planet creates tides on the planet that are slowing the planet’s rotation. The planet’s rate of rotation is decreasing at a rate of 7.00 x 10-7 radians/sec/century. The mass of the planet is 6 x 1024 kg, and its diameter is 12,600 km. The radius of the circular orbit of the moon about the planet is 386,000 km. If the moon’s mass is 7.35 x 1022 kg, at what rate is the moon’s distance from the center of the planet increasing? [You may assume that the planet is a uniformly dense sphere.] You must show your work on an attached sheet.

    ∆r/∆t= __________________ km/year

    2. Relevant equations

    I know we will need the universal gravitation equation. possibly, tidal force equations. Can anyone attempt this?

    3. The attempt at a solution
  2. jcsd
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