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Understand: Newton’s law of universal gravitation

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Problem

The gravitational force between a pair of identical twins who each have a mass of 75, point, 6, start text, space, k, g, end text is 6, point, 126, times, 10, start superscript, minus, 10, end superscript, start text, N, end text.
Calculate the distance between the twins.
Write your answer using three significant figures.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, start text, p, i, end text or 2, slash, 3, space, start text, p, i, end text
start text, m, end text
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