The Triton-X is a robotic underwater probe used for deep-sea exploration.
The average density of sea water is 1025 kg/m3.
State the equation linking pressure difference, depth, density and ggg.
Calculate the increase in pressure as the Triton-X descends from the surface to a depth of 850 m. (Take g=10 m/s2g = 10\text{ m/s}^2g=10 m/s2)
Atmospheric pressure is 1.0 × 105 Pa.
Calculate the total pressure on the Triton-X when it is at a depth of 850 m.
On another descent, the Triton-X experiences a total pressure of 55 × 105 Pa. The access hatch on the probe has an area of 2.4 m2.
State the equation linking pressure, force and area.
Calculate the force on the outside of the hatch.
The Triton-X is also tested in a deep freshwater lake, where the density of water is 1000 kg/m3. Explain why the pressure on the probe in the lake water is less than the pressure in sea water at the same depth.
A student is given a sample of liquid labelled sea water. Describe an experiment that the student could carry out to find the density of the sample.