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**1. Homework Statement**

A novice diver swimming in a lake at a depth of 6m tries to breathe with a snorkel tube that reaches to just above the surface of the water. Assume that the lake water density equal 1000kg/m³

1) What is the pressure difference between the external pressure on him and the air pressure in his lungs?

2) Do you think it's possible for the diver to breathe through a snorkel at such a depth as in (1)? Explain.

3) At another time, the diver changes surfaces while holding his breathe. The difference between the air pressure and the pressure in his lungs as he reaches the surface is 9000Pa. From what depth did he start?

4) Do you think that the diver's action in (3) is hazardous to his health? Explain.

**2. Homework Equations**

Pressure=pgh

P=F/A

m=pV

**3. The Attempt at a Solution**

Okay, so after I read the first part of the question: Difference between the external pressure on him and the air pressure in his lungs... I got a little confused. How can I calculate the pressure difference if the swimmer and the swimmer's lungs are in the same distance from the water surface? Or is this somehow a "trick question" where the answer is that there is no difference?

Could anyone confirm?

Thanks