The figure from below shows a bar which mass is $3\,kg$ and a circular plate which its mass is $5\,kg$. Assume that both are homogeneous. Find the modulus of the force that the floor excerts to the circular plate. Assume that the acceleration due gravity is $10$ meters per second square and point $O$ is a screw which joins the bar with the circular plate.

The alternatives are as follows:

$\begin{array}{ll}

1.&15N\\

2.&30N\\

3.&65N\\

4.&50N\\

5.&60N\\

\end{array}$

In this problem, I'm lost as to exactly how I should take the interpretation of the forces acting on the body. Can someone help me with the FBD for this object please? At first, I assumed that since there are $3$ and $5$ kilograms then the reaction would be 15N upwards. But I'm not sure about this answer. Help please?