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The magnitude of the Earth's gravitational force on a point mass is F(r), where r is the distance from the Earth's center to the

The magnitude of the Earth's gravitational force on a point mass is F(r), where r is the distance from the Earth's center to the point mass. Assume the Earth is a homogeneous sphere of radius R. F(R) What is -? F(2R) (a) 32 (b) 8 (c) 4 (d) 2

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