If \( R \) is the radius of the earth and \( g \) the acceleration ...

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If \( R \) is the radius of the earth and \( g \) the acceleration due to
\( \mathrm{PW} \) gravity on the earth's surface, the mean density of the earth is
(a) \( 4 \pi \mathrm{G} / 3 \mathrm{gR} \)
(b) \( 3 \pi R / 4 g G \)
(c) \( 3 \mathrm{~g} / 4 \pi \mathrm{RG} \)
(d) \( \pi \mathrm{Rg} / 12 \mathrm{G} \)
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