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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.
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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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