Question

if r is the radius of earth and g is the acceleration due to gravity on earth surface then mean density of earth is
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Answer 1

We know that:

g= GM/R^2

density= mass/volume

mass= density × volume

[M = p × 4πR^3/3R^2]---------substitute in the above formula

therefore : g=GM/R^2

p=3g/4πrg

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