$A$ black hole is a:

The force of mutual attraction between any two objects by virtue of their masses is

Explain the gravitational force exerted by an extended object.

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

$A$ point mass '$m$' is located at a distance '$r$' from the end of a uniform thin rod of mass '$M$' and length '$L$' as shown in the figure. The magnitude of the gravitational force of attraction is

The distance of the planet Pluto from the Sun is $40$ times the distance of the Earth from the Sun. Assuming the masses of the Earth and Pluto are equal,find the ratio of the gravitational force exerted by the Sun on the Earth to that on Pluto.