Three identical spheres each of mass `m` and radius `R` are placed touching each other so that their centres `A,B` and `C` lie on a straight line. The position of their centre of mass from centre of `A` is

Determine the position of the centre of mass of a hemisphere of radius R.

Three identical spheres each of mass M and radius R are arranged in a row touching each other and their centres collinear.The moment of inertia of the system about an axis passing through the centre of the middle sphere and perpendicular to the line joining their centres is "

Three identical particles each of same mass are placed touching each other with their centres on a straight line.Their centres are at A,B,and C respectively.Then distance of centre of mass of the system from A is

Three identical spheres, each of mass 1 kg are kept as shown in figure, touching each other, with their centres on a straight line. If their centres are marked P, Q, R respectively, the distance of centre of mass of the system from P (origin) is

Three identical spheres each of radius R are placed thouching each other on a horizontal table as shown in figure. The co-ordinates of centre of mass are : .

Four identical bodies each of mass 1 kg are placed touching to each other with centres on a straight line. If their centres are marked A, B, C and D respectively, then the distance of centre of mass of the system from B will be

Three identical spheres of mass M each are placed at the corners of an equilateral triangle of side 2 m. Taking one of the corners as the origin, the position vector of the centre of mass is