Answers to AQA GCSE Pressure due to a column of liquid(Physics)
Practice Questions
1. A glass marble is dropped into oil as shown below:
Describe how the pressure changes on the marble as it sinks lower in the oil.
As the marble sinks lower through the oil, the pressure acting on the marble increases. This is because the height between surface of the oil and the marble is increasing
2.A brick is at the bottom of a swimming pool 5m from the surface of the water. Density of water is approx 1000kg/m3. Calculate the pressure experienced by the brick.
(ignore any pressure effects due to atmosphere)
Pressure = height x density x gravitational field stength
Pressure = 5m x 1000kg/m3 x 9.8N/kg
Pressure = 49050Pa
3. A submarine has been build to withstand a maximum water pressure of 6MPa. Assuming that sea water has a density of 1030kg/m3. Calculate the maximum operating depth of the submarine in the water.
(ignore any presssure effects due to atmosphere).
Pressure = height x density x gravitational field stength
height = Pressure/(density x gravitational field strength)
6MPa = 6 x 106 Pa
height = 6 x 106 Pa/ (1030kg/m3 x 9.8 N/kg)
height = 594m
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