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OpenStudy (anonymous):
Earth's radius is approximately 6400 km. What is the surface area & volume of the earth?
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OpenStudy (isaiah.feynman):
If you know the formulas for volume and surface area of a sphere, you can also apply this to your own planet. :)
OpenStudy (kainui):
What's the average density of the earth?
OpenStudy (isaiah.feynman):
5 g/ cm^3. But that's not needed to solve this question.
OpenStudy (kainui):
What's a formula for air pressure as you change altitude?
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