Question
Sneezing requires an increase in pressure of the air in the lungs; a typical sneeze might result in an extra pressure of $7.0 \mathrm{kPa}$. Estimate how much force this exerts on the diaphragm, the large muscle at the bottom of the ribcage.
Step 1
The average diameter of the diaphragm is about 30 cm, so its radius is 15 cm or 0.15 m. The area of a circle is given by the formula A = πr², so: A = π(0.15 m)² ≈ 0.0707 m² Show more…
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During forced exhalation, such as when blowing up a balloon, the diaphragm and chest muscles create a pressure of 60.0 $\mathrm{mm}$ Hg between the lungs and chest wall. What force in newtons does this pressure create on the 600 $\mathrm{cm}^{2}$ surface area of the diaphragm?
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