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If the Moon takes 27.3 days to complete its orbital path around the Earth, and the...

If the Moon takes 27.3 days to complete its orbital path around the Earth, and the orbit has a radius of 3.8 x 108 meters, what is the Earth's Mass? Express your answer using scientific notation with three significant figures.

(Note: Earth's Mass has been listed on other materials and questions. The value for the Moon's orbital period has been modified so it's close to that value, but not exactly that value. Make sure to do the calculations for this one!)
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