The mass of the moon is 1/81 of the eart...

The mass of the moon is `1/81` of the earth but the gravitational pull is `1/6` of the earth. It is due to the fact that

the radius of the moon is `(81)/6` of the earth

the radius of the earth moon is `9/(sqrt6)` of the moon.

moon is the satellite of the earth

moon rotates round the earth

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