Suppose that you are on a planet, that has an average radius of 1*10^9 meters and average density 7.4 kg/m^3. Assuming that it is a perfect sphere, find the mass of the planet.

Question

cj7529 · Answer

Density = mass / volume
so, mass = Density x volume
Density is given
Volume of a sphere = 4/3 Pi r^3
r is the radius of the planet

anonymous · Answer

I got 4.1889 * 10^27 for the volume. Is this correct?

cj7529 · Answer

yeah that's right, now just multiply that by the density and it will give you the mass of the planet