A small point mass m is placed at the centre of curvature of acircular are of radius R and mass 3 m as shown in figure`-6.31.`Find the net gravitational force acting on the point mass.

A particle of mass m is placed on centre of curvature of a fixed, uniform semi-circular ring of radius R and mass M as shown in figure. Calculate: (a) interaction force between the ring and the particle and (b) work required to displace the particle from centre of curvature to infinity.

A point mass m is placed inside a spherical shell of radius R and mass M at a distance R/2 form the centre of the shell. The gravitational force exerted by the shell on the point mass is

A point mass m is placed inside a spherical shell of radius R and mass M at a distance R/2 form the centre of the shell. The gravitational force exerted by the shell on the point mass is

A body of mass m is placed at the centre of the spherical shell of radius R and mass M. The gravitation potential on the surface of the shell is

A body of mass m is placed at the centre of the spherical shell of radius R and mass M. The gravitation potential on the surface of the shell is

Six particles each of mass m are placed at the corners of a regular hexagon of edge length a . If a point mass m_0 is placed at the centre of the hexagon, then the net gravitational force on the point mass is

A point mass m and a uniforms thin rod (mass M and length h) are shown in figure. Find the gravitational force of attraction between them

A mass m is placed at point P lies on the axis of a ring of mass M and radius R at a distance R from its centre. The gravitational force on mass M is

A mass m is placed at point P lies on the axis of a ring of mass M and radius R at a distance R from its centre. The gravitational force on mass m is