Is the statement "$A$ particle has point volume" true or false?

$A$ straight rod of length $L$ has one of its ends at the origin and the other at $x = L$. If the mass per unit length of the rod is given by $\lambda = Ax$ (where $A$ is a constant),then where is its center of mass from the origin?

The moment of inertia of an $HCl$ molecule about an axis passing through its centre of mass and perpendicular to the line joining the $H^+$ and $Cl^-$ ions is,if the interatomic distance is $1 \ \mathring A$:

In the case of a system of two particles of different masses,the centre of mass lies

Write the meaning of homogeneous bodies.

If the density of the material of a circular plate and a square plate as shown is the same,the center of mass of the composite system will be: