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Question
Is there any meaning of “weight of the earth”?
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Solution
The weight of a body is always due to its gravitational attraction to earth. As law of gravitational attraction is universal so it applies to any two bodies (earth and sun as well). So we can define the weight of earth with respect to a body of mass comparable to or greater than earth’s, due to the gravitational attraction between earth and that body. But practically nobody on earth has mass comparable to earth, so the weight of earth will be a meaningless concept with respect to the earth frame.
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