Two identical pressure-operated valves are fitted at different levels in the side of an open tank containing liquid soap. Each valve has a small flat face, so the pressure over each face can be treated as uniform.
| Quantity | Value |
|---|---|
| Depth of the upper valve below the liquid surface | 0.45 m |
| Depth of the lower valve below the liquid surface | 1.25 m |
| Area of each valve face | 60 cm2 |
| Density of the liquid soap | 1050 kg/m3 |
| Gravitational field strength, ggg | 9.8 N/kg |
Calculate the difference between the forces exerted by the liquid soap on the two valve faces.
108 exam-style questions on AQA GCSE Physics 5.5 Pressure and pressure differences in fluids, covering 5.5.1 Pressure in a fluid and 5.5.2 Atmospheric pressure. Each one has a worked solution and a mark scheme showing where the marks go.