A pipe full of water connects a reservoir on a hill to a valve lower down the hill. The length of the pipe is 400 m400\text{ m}400 m. The vertical height of the reservoir above the valve is 80 m80\text{ m}80 m. The density of the water is 1000 kg/m31000\text{ kg/m}^31000 kg/m3. The effect of atmospheric pressure is negligible. Taking g=10 m/s2g = 10\text{ m/s}^2g=10 m/s2, what is the water pressure at the valve?
188 exam-style questions on CIE IGCSE Physics Pressure, covering Pressure. Each one has a worked solution and a mark scheme showing where the marks go.