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Heroes in movies hide beneath water and breathe through a hollow reed (villains never catch on to this trick). In practice, you cannot inhale in this manner if your lungs are more than 60.0 $\mathrm{cm}$ below the surface. What is the maximum negative gauge pressure you can create in your lungs on dryland, assuming you can achieve $-3.00 \mathrm{cm}$ water pressure with your lungs 60.0 $\mathrm{cm}$ below the surface?

$P_{\max }=-63.0 \mathrm{cm} \mathrm{H}_{2} \mathrm{O}$

Physics 101 Mechanics

Chapter 11

Fluid Statics

Fluid Mechanics

University of Michigan - Ann Arbor

Simon Fraser University

Hope College

Lectures

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we're told that heroes that movies high beneath water and breathe through a hollow reed Actually, I've seen more villains, too. Here in practice, you cannot inhale in this manner if your lungs are more than 60 centimetres below the surface. So what is the maximum negative gauge pressure you can create in your lungs on dry land, assuming you can achieve minus three centimeters of water pressure with your lungs 60 centimetres below the surface. So if we have ourself down here 60 centimetres below the surface, E actually don't have a They read a hollow reed connected to us, but they mentioned it in the problem. So the depth is 0.6 meters. The pressure at one down here is 60 centimetres of water because we're 62 centimeters below surface. So the change in the gauge pressure the delta pressure between the pressure here being the pressure outside us and the pressure in our lawns is minus three centimeters of water. And so we get that pressure in our lungs is 30 in 63 centimeters of water. And if we come back up to the surface, then we are gauge. Pressure is our total total pressure is one atmosphere minus 63 centimeters of water. So our gauge pressure in the air is minus 63 centimeters of water.

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