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Question

If R is the radius of the earth and g the acceleration due to gravity on the earth's surface, the mean density of the earth is =……

  1. 4 pi G divided by 3 g R
  2. 3 pi R divided by 4 g G
  3. 3 g divided by 4 pi R G
  4. pi R G divided by 12 g

The correct answer is: 3 g divided by 4 pi R G

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