The change in the gravitational potential energy when a body of a mass m is raised to a height nR above the surface of the earth is (here R is the radius of the earth)

A point P (R root3, 0, 0) lies on the axis of a fixed ring of mass M and radius R. The rings is located in the YZ plane with its centre at origin O. A small particle of mass m starts from P and reaches O under gravitational attraction only. Its speed at O [...]

A solid sphere of mass M and radius R has a spherical cavity of radius R/2 such that the centre of cavity is at a distance R/2 from the centre of the sphere. A point mass m is placed inside the cavity at a distance R/4 from the centre of sphere. The gravitational force on [...]

An astronaut on a strange planet finds that acceleration due to gravity is twice as that on the surface of Earth. Which of the following could explain this? (A) Both the mass and radius of the planet are twice as that of Earth. (B) Mass of the planet is half as that of Earth, but [...]

The change in the gravitational potential energy when a body of a mass m is raised to a height nR above the surface of the earth is (here R is the radius of the earth) The change in the gravitational potential energy when a body of a mass m is raised to a height nR [...]