A sealed lamp housing hangs from a force meter. The force meter reads 7.0 N when the housing is in air.
An engineer lowers the housing into an unknown test liquid. The housing displaces 500 cm3 when it is held stationary and completely submerged without touching the container. The force meter now reads 4.0 N.
Take g=10 N/kgg=10\ \mathrm{N/kg}g=10 N/kg and neglect upthrust in air.
| Liquid | Density in kg/m3\mathrm{kg/m^3}kg/m3 |
|---|---|
| P | 600 |
| Q | 800 |
| R | 1400 |
| S | 2200 |
What is the unknown liquid?
liquid P
liquid S
liquid Q
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.