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March 5, 2015

March 5, 2015

Posted by **APpreciative student** on Sunday, January 2, 2011 at 9:54pm.

thank you

astronauts on their way to the moon reach a point --> at this point, the moon's gravitational pull becomes stronger than the earth's gravitational pull-----find the distance between this point and the center of the EARTH

- ap physics c -
**MathMate**, Sunday, January 2, 2011 at 11:27pmEquate the gravitational pulls from the earth and the moon.

Let

D=distance between the*centres*of the earth and the moon.

x=distance of the equality point from the centre of the earth.

M=mass of the earth

m=mass of the moon

Then

GM/x² = Gm/(D-x)²

Solve for x in terms of D, M and m.

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