A-LevelPhysicsForces, density and pressure9702/12 · May/June 2022 · Q151 Mark
A closed U-shaped tube contains a stationary liquid of density ρ. One side of the tube contains a gas at pressure p₁ and the other side contains a gas at pressure p₂, as shown. [Figure 15.1] The acceleration of free fall is g. Which equation is correct?
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Ap₁ = ρgy
Bp₂ = ρg(x – z)
Cp₁ – p₂ = ρg(y – z)
Dp₁ + p₂ = ρgx
✓ Correct answer
C: p₁ – p₂ = ρg(y – z)
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