A marine scientist lowers a pressure probe into the sea. The pressure due to the seawater is measured at depths of 1.0 m and 5.0 m below the surface. The two readings differ by 41 200 Pa41\,200\ \text{Pa}41200 Pa. The gravitational field strength is 10 N/kg.
What is the density of the seawater?
824 kg/m3824\ \text{kg/m}^3824 kg/m3
4120 kg/m34120\ \text{kg/m}^34120 kg/m3
1030 kg/m31030\ \text{kg/m}^31030 kg/m3
10 300 kg/m310\,300\ \text{kg/m}^310300 kg/m3
108 exam-style questions on AQA GCSE Physics 5.5 Pressure and pressure differences in fluids, covering 5.5.1 Pressure in a fluid and 5.5.2 Atmospheric pressure. Each one has a worked solution and a mark scheme showing where the marks go.