the mass of the earth is 5.98 x 10^24 kg, and the average diameter is 12,700 km. Assum42ng the Earth is spherical, what is the average density of our planet in the g/cm^3
5.98 x 10^24 kg = 5.98 x 10^27 gm
Diameter = 12700 km radius = 6350 x 10^5 cm
VOLUME of sphere = 4/3 pi r^3
5.98 x 10^27 gm / ( 4/3 pi (6350 x 10^5 cm)^3 ) = answer