A sealed sensor module hangs from a force meter, which reads 9.0 N when the module is in air. The module is then lowered until it is fully under water, hanging freely clear of the bottom and sides of the tank. The force meter now reads 5.0 N.
The density of water is 1000 kg/m3. Take g=10 N/kgg=10\ \mathrm{N/kg}g=10 N/kg and neglect upthrust in air.
What is the volume of the module?
900 cm3900\ \mathrm{cm^3}900 cm3
1400 cm31400\ \mathrm{cm^3}1400 cm3
400 cm3400\ \mathrm{cm^3}400 cm3
500 cm3500\ \mathrm{cm^3}500 cm3
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.