what is gravitation of Earth at it's center

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what is solid angle subtended by moon at any point of earth The diameter of moon is3474km and its distance from earth is3. 84*10^-8

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Answer 1

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Gravitational force reduces as you move away from the surface of the Earth.And as you move to the interior of the Earth the force increases.But as you reach the center of the Earth there is equal mass on all sides and they cancel each other.Thus the gravitational force at the center of Earth is zero.

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