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Posted by on Wednesday, September 7, 2011 at 5:14pm.

could you estimate the mass of the entire earth? How? If we cannot direct measure the earth's mass, how was it determined?

  • physics - , Wednesday, September 7, 2011 at 5:22pm

    Easy. Take a known mass, say 1 kilogram.

    put it on a scale, and weight it. It ought to weigh 9.8Newtons.

    But this is the force of gravity:

    F=GMe*1kg/radiusearth^2

    solve for Me

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