Question

A diver is at a depth of 25 m beneath the surface of a lake. He carries a cylinder of
high-pressure air on his back.
(a) (i) Explain how the air molecules exert a pressure on the inside surface of the cylinder.
[3]
(ii) The diver gradually uses up the air in the cylinder. Explain why the pressure falls.
... [1]
(b) The density of the water in the lake is 1000 kg/m3 and the atmospheric pressure at the
surface is 1.0 105 Pa.
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Calculate the total pressure 25 m beneath the surface of the lake.​

Answer 1

Answer:

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