A sealed underwater camera housing is held at rest by a force meter. It is fully immersed in each of two liquids without touching the container.
The external volume of the housing does not change.
| Liquid | Density in kg/m3\text{kg/m}^3kg/m3 | Force-meter reading in N\text{N}N |
|---|---|---|
| P | 750 | 20 |
| Q | 1100 | 6.0 |
The gravitational field strength, ggg, is 10 N/kg.
Calculate the external volume of the housing.
Calculate the weight of the housing.
The housing is fully immersed in liquid R, which has a density of 1300 kg/m3. It is then detached from the force meter.
Explain what happens immediately after the housing is detached and whether it can float at rest in liquid R.
132 exam-style questions on Edexcel GCSE Physics 15.2 Pressure in fluids, covering 15.2.1 Atmospheric pressure and height, 15.2.2 Pressure in fluids, 15.2.3 Pressure, force and area, 15.2.4 Pressure and depth, 15.2.5 Pressure in liquids: depth and density, 15.2.6 Upthrust, and 15.2.7 Floating and sinking. Each one has a worked solution and a mark scheme showing where the marks go.