Question

Figure shows the vertical cross-section of a vessel filled with liquid of density ρ. The normal thrust per unit area on the walls of the vessel at point P, as shown will be:

Options

• h ρ g 

• (H - h) ρ g

• (H - h) ρ g cos θ

• H ρ g

Answer 1

(H - h) ρ g

Explanation:

Liquid pressure is always normal to the surface

Hence thrust per unit area at point

P = (H - h) ρ g.