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Mathematics 16 Online
OpenStudy (anonymous):

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

OpenStudy (mathstudent55):

The radius is 1 x 10^9 in what units?

OpenStudy (anonymous):

Im sorry. Meters

OpenStudy (mathstudent55):

Use the folrmula for volume of a sphere: V = (4/3) pi r^3 using the given radius. That'll give you the volume in cubic meters. Then multiply by the density to get mass in kg.

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