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