The atmosphere is held to the earth by

Let $G, W, E$ and $S$ be the relative strengths of gravitational,weak-nuclear,electromagnetic,and strong-nuclear forces,respectively. Which of the following statements is correct?

Two identical solid copper spheres of radius $R$ are placed in contact with each other. The gravitational attraction between them is proportional to

If the mass of two bodies is doubled and the distance between them is also doubled,what happens to the new gravitational force?

Mass $M$ is divided into two parts $xM$ and $(1-x)M$. For a given separation,the value of $x$ for which the gravitational attraction between the two pieces becomes maximum is

The gravitational force $F_g$ between two objects does not depend on