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13 Assume that a tunnel is dug through earth from North pole to south pole...

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13 Assume that a tunnel is dug through earth from North pole to south pole and that the earth is a non rotating uniform sphere of density p The gravitational force on a particle of mass m dropped into the tunnel when it reaches a distance r from the centre of earth is 3 1 2 mGp r 3 4 m r 2 4 4 4T mGp r 3 4 m Gr

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