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physics book question chapter: gravitation A2

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please solve this one :
What is the difference between the acceleration of the earth towards the sun when an eclipse of the sun occurs and when an eclipse of the moon occurs? Give your answer in terms of Me, mass of earth.
(Mm=mass of moon, R= radius of the earth's orbit about the sun, r= radius of moon's orbit around the earth)
the question is from the book: pacific physics alevel vol 1 page 211.
its my homework...please help!
 
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