Question

14. Distance between earth and moon is 3.8 x 10 km and the mass of earth is 81 times the
mass of the moon. Find the CM of earth moon system lies.
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Answer 1

Answer:

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Answer 2

Answer:

ANSWER

Let at the point P the net gravitational force be zero.

Let,M=mass of the Earth

m=mass of the moon

m =mass of the object

M=81cm (given)

(R−r) 2Gmm

= r 2Gmm

=> (R−r) 281 = r 2

=> {(3.8×10 5 )−r} 281 = r 21

Solving,we get ,r=3.8×10 7 m