An open dosing cylinder contains a liquid above a horizontal piston of area 0.0050 m2. When the liquid is 2.0 m deep and atmospheric pressure is 100 kPa, the total downward force on the upper face of the piston is 600 N. The liquid depth is reduced to 1.0 m and atmospheric pressure falls to 98 kPa. The density of the liquid does not change.
What is the new total downward force on the upper face of the piston?
590 N590\ \mathrm{N}590 N
600 N600\ \mathrm{N}600 N
550 N550\ \mathrm{N}550 N
540 N540\ \mathrm{N}540 N
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.