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It is well known that there exists a gra...

It is well known that there exists a gravitational force of attraction between the Earth and the sun. Then, why does the Earth not collide with the sun? Is it possible for three bodies of equal mass to be at rest relative to each other? Explain.

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What is centripetal and centrifugal force? What are the directions of the forces of attraction possible for three bodies of equal masses to be at rest relative to each other and revolving around a given centre. What is the direction of the net force acting on each mass? Will this net force produce centripetal force?
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