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  • Perplex
    IB Math AIHL
    /
    Modelling
    /

    Problem Bank

    [Maximum mark: 5]

    The gravitational force of the Sun on a planet is proportional to the mass of the planet, and inversely proportional to the square of the distance between the planet and the Sun.


    Let ​F​ be the gravitational force exerted by the Sun on Earth, which has a mass of ​6×1024kg​ and is ​1AU​ (astronomical unit) from the Sun.


    Neptune's mass is approximately ​17​ times that of Earth, and it is ​30AU​ from the Sun.

    1. Find an expression in terms of ​F​ for the gravitational force exerted by the Sun on Neptune.

      [2]

      To earn a crown, get your answer ready before you reveal the options!

    The force of gravity of the Sun on Jupiter, which is ​5.20AU​ from the Sun, is ​12​ times that force on Earth.

    1. Calculate the mass of Jupiter.

      [3]

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