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A level physics help needed

Two identical uniform spheres each of radius R are placed in contact. The gravitational force between them if F.

The spheressential are now separated until the force of attraction is F/9
What is the distance between the surfaces of the spheres after they have been separated
A) 2R
B) 4R
C) 8R
F) 12R
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Original post by tylerplatt
Two identical uniform spheres each of radius R are placed in contact. The gravitational force between them if F.

The spheressential are now separated until the force of attraction is F/9
What is the distance between the surfaces of the spheres after they have been separated
A) 2R
B) 4R
C) 8R
F) 12R

How does the gravitational force vary with distance?
What happens to it if you, say, double the distance?
What is the initial separation of the centre of gravities?
(edited 5 years ago)

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