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OpenStudy (anonymous):
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.
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OpenStudy (cj7529):
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
OpenStudy (anonymous):
I got 4.1889 * 10^27 for the volume. Is this correct?
OpenStudy (cj7529):
yeah that's right, now just multiply that by the density and it will give you the mass of the planet
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