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A 1.0 kg mass weighs 9.8 N on Earth's surface, and the radius of Earth is roughly 6.4 x 10^6 m. Calculate the average density of Earth

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A 1.0kg mass weighs 9.8 Newton on earth's surface, and the radius of Earth is roughly 6.4 x 10 to the power of 6. The mass of the earth is 6.02 x 10 to the power of 24. Calculate the average density of Earth?
Physics  Damon, Monday, December 24, 2012 at 3:42pm
Mass over volume:
rho = 6.02 * 10^24 * 10^18 / [(4/3) pi 6.4^3] 
6*5e10
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