A circular plate of diameter a is kept in contact with a square plate of edge a as shown in figure (9.Q2). The density of the material and the thickness are same
everywhere. The centre of mass of the composite system will be
This is also a simple conceptual estimation problem, rather a mathematical one. We can interpret that, this circular plate of diameter a can be fit into the square of edge a and still there will be some area left in square. So the mass distribution of square is more than circle in both x and y directions. So, the Centre of Mass also should be inside the square plate.