Pressure difference between the top and bottom surfaces of this cube

[Say17]

Homework Statement

We consider the case where the wagon is at rest in profile view (below). Determine the pressure difference deltarho = rho under - delta on between the pressure under the inner surface of the cube and the pressure on the upper surface of the cube.

Relevant Equations

rho = F/A

Hi all,

I think I have to take the formula for pression. rho = F/A -> rho = ma/A but not sure, how to handle it here.

I thought, it should be rho under - rho above = pl*L - pc *a

Solution is: pl *g *a

 

[Doc Al]

ρ stands for density, not pressure. ρ_l would be the density of the liquid that fills the wagon. (I presume that's what's going on here.)

How does pressure relate to the depth below the surface of a fluid?

 

[Say17]

It's the length from beginning of the cube till ground?

 

[Doc Al]

The pressure within the liquid depends on the depth below the surface. Pressure increases with depth.

Read this: Static Fluid Pressure