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(C) According to Newton's law of universal gravitation,the force $F$ between two point masses $m_1$ and $m_2$ separated by a distance $r$ is given by

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universal gravitational constant

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(C) According to Newton's law of universal gravitation,the force $F$ between two point masses $m_1$ and $m_2$ separated by a distance $r$ is given by $F = G \frac{m_1 m_2}{r^2}$,where $G$ is the universal gravitational constant.If $m_1 = 1 	ext{ unit}$,$m_2 = 1 	ext{ unit}$,and $r = 1 	ext{ unit}$,then $F = G \frac{1 	imes 1}{1^2} = G$.Therefore,the force of attraction between two unit point masses separated by a unit distance is numerically equal to the universal gravitational constant $G$.

The force of attraction between two unit point masses separated by a unit distance is called

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