Acube of each side of 3m length is subjected to normal force of 36n. what will be stress?

To calculate the the stress on the cube, we use the formula

Here, F is the normal force on the cube and A is surface area of the cube.

We know that every cube has six faces, therefore surface area of the cube,

But according to question, the force is subjected to normal on the cube, therefore we take only one face of cube, then the surface area of the cube,  

As given,  

Given  

Thus,

seeing the graph would