A sealed inspection probe is held fully immersed in oil. The probe body has a mass of 18 kg. A sensor module of mass 6.0 kg is housed entirely inside the probe. The combined external volume of the probe body and the enclosed sensor module is 0.030 m3. The density of the oil is 850 kg/m3. Take g=10 N/kgg=10\ \mathrm{N/kg}g=10 N/kg.
Calculate the initial resultant force on the probe and sensor module when they are released. Give the direction of the resultant force.
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.