Question

If acceleration due to gravity =9.8ms2 and radius of earth is 6.38 *10^6 what is the mass of earth

Answer 1

let Me be the mass of earth. then,
g=GMe/R^2
9.8=(6.67×10^-11×Me)/6.38×10^6
Me=9.8/6.67×10^-11 ×6.38×10^6=6×10^24
mass of earth=6×10^24