The average density of the earth

For what value of the angular velocity of the earth, the acceleration due to gravity in the equatorial region would have been zero ? The average density of the earth's material =5.5 g*cm^(-3) and G=6.67xx10^(-8) CGS unit. Find the ratio of this calculated value and the present value of the angular velocity of the earth.

The time period 'T' of the artificial satellite of earth depends on the average density rho of the earth as

Average density of earth is

Average density of the earth in a region (g is acceleration due to gravity)

Calculate the average density of earth in terms of g, G and R.

Calculate the average density of earth in terms of g, G and R.