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March 27, 2015

March 27, 2015

Posted by **hanu** on Wednesday, September 19, 2012 at 5:53am.

- earth -
**Steve**, Wednesday, September 19, 2012 at 1:55pmacceleration on earth: GM/r^2

acceleration on planet X: GM'/(r/2)^2

GM'/(r/2)^2 = 2GM/r^2

4M'/r^2 = 2M/r^2

M' = M/2

makes sense, since with the same mass and half the radius, the force would be 4 times as much.

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