Who among the following gave the first experimental value of $G$?

$A$ mass $M$ is divided into two parts $xM$ and $(1 - x)M$. For what value of $x$ is the gravitational force between them maximum for a given distance?

What is the strength of the gravitational force compared to the strong nuclear force?

The gravitational force between two identical uniform solid gold spheres of radius $r$ placed in contact is proportional to:

Two objects,each of mass $1\,kg$,are placed at a distance of $10\,cm$ from each other. Calculate the gravitational force between them.

$A$ system consists of three particles each of mass $m_1$ placed at the corners of an equilateral triangle of side $\frac{L}{3}$. $A$ particle of mass $m_2$ is placed at the midpoint of any one side of the triangle. Due to the system of particles,the force acting on $m_2$ is