Answer:
[tex]F=6200\ \text{N}\\[/tex]
Explanation:
In this problem you need to define the force that acts upon a beam in a 3 point bending problem. I put a picture of the problem taken from Wikipedia:
In this problem the flexural strength is defined with the following formula:
[tex]\sigma=\cfrac{3FL}{2bd^2}[/tex]
where F is the force applied, L the length between the two rods, b the width of the ceramic block and d it's height.
The force is then defined as:
[tex]F=\cfrac{2\sigma bd^2}{3L}=6200\ \text{N}[/tex]
