If R is the radius of the earth and g the acceleration due to gravity

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1

If R is the radius of the earth and g the acceleration due to gravity on the earth’s surface, the mean density of the earth is
a) 4π G/3gR
b) 3π R/4gG
c) 3g/4π RG
d) πRg/12G

2

If R is the radius of the earth and g the acceleration due to gravity on the earth’s surface, the mean density of the earth is
a) 4π G/3gR
b) 3π R/4gG
c) 3g/4π RG
d) π Rg/12G
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