1)Center of gravity of a body is the point at which the weight of the body acts
2) Center of mass coincides with the centre of gravity if the earth is assumed to have an infinitely large radius
3) To evaluate the gravitational field intensity due to any body at an external point, the entire mass of a body can be considered to be concentrated at its centre of mass.
4) The radius of gyration of any body about an axis is the length of the perpendicular dropped from the c.a of the body to the axis.
Which one of the following pairs of statements is correct
(4) and (1)
(1) and (2)
(2) and (3)
(3) and (4)
As we have learned
Centre of gravity -
The Centre of gravity of a body is a point, through which the resultant of all the forces experienced by various particles of the body due to the attraction of the earth, pass irrespective of the orientation of the body.