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    Radius, Mass of Planets and Period of Pendulum

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    My problem is understanding this because I have to calculate the mass and radius of 3 planets along with the graviational acceleration and then find the period of a 2 meter long pendulum on each planet for the assignment.

    The instructor posted a formula that he used in Excel but there was no explanation.

    The formula: =6.67x(10^-11) x 3x(10^25)/(64x(10^12))

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    Solution Preview

    Ok the basic formula for the Force attributed to gravity is:

    F = {GM/r^2 } m = mg

    The constant G appearing in Newton's law of gravitation, also known as the universal gravitational constant,
    G is supposed to be a universal constant ...

    Solution Summary

    Information is provided as to how to calculate Radius, Mass of Planets and Period of a Pendulum.