A level sensor uses a sealed cuboid float inside a tank of liquid fertiliser. During a test, the float is held completely below the surface.
The float measures 0.40 m by 0.20 m by 0.060 m.
The density of the liquid fertiliser is 1100 kg/m3. The gravitational field strength, ggg, is 10 N/kg.
A computer model gives the upward force exerted by the liquid on the float as 52.8 N.
Show that the computer model's value can be obtained from the amount of liquid displaced by the float.
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.