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    The mass and radius of the Earth are 81 and 4 times, respectively, than that of the Moon. What is the gravitational field strength on the surface of the
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    (Original post by Zulaikha98)
    The mass and radius of the Earth are 81 and 4 times, respectively, than that of the Moon. What is the gravitational field strength on the surface of the
    Moon?

    you'd say F is proportional to M/r2 for both the moon and the earth

    that'd get you a ratio of field strengths

    apply the ratio to the known value of the earths surface field strength to get the field strength on the moon.
 
 
 
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