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Physics 17 Online
OpenStudy (anonymous):

Why does the gravitational acceleration (g) decrease at the distance further from 4500 m below the sea level? and what is the value of g is at the center of the earth? (from Thermodynamics: An Engineering Approach by Yunus Cengel (5th edition) Ch.1 page 7)

OpenStudy (vincent-lyon.fr):

Gravitational field due to Earth is zero at its centre.

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