Agrape and apple and a watermelon are arranged at the corners of a triangle so that each piece of fruit is three meters away from the other two the gravatational force between which two pieces of fruit will be the greateset

-- There are three pairs of mass with gravitational forces between them.

-- The distances between the masses are the same for each pair.

-- The only other quantity that determines the strength of the gravitational
force is the product of the masses.

-- The product of the masses is greatest for the apple and the watermelon,
so the strength of the gravitational force between them is the greatest.

An atom that has fewer electrons that protons is called a positive ion.

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