NEST2021PhysicsThermodynamics
The inhalation and exhalation processes of breathing are modelled using a relationship between the gauge pressure (P) and volume (V) of lungs as V=A[1- (-k P)] where A and k are the positive constants (see figure for a schematic sketch). For a healthy human adult, during inhalation A=3.57 10⁻³ ~m ^3 and k=0.964 10⁻³ Pa ⁻¹ . The corresponding values during exhalation are given as A=3.35 10⁻³ ~m ^3 and k=1.644 10⁻³ ~Pa
Options
- AThe net work done by human body during one complete inhale-exhale cycle is approximately 0.82 J
- Bd P / d V is zero at the beginning of the inhalation process.
- CThe model assumes that volume of lung collapses to zero at the absolute pressure equal to atmospheric pressure
- DThe heat input during inhale process is around 25 J .
Correct answer
D. The heat input during inhale process is around 25 J .
Step-by-step solution
No solution available.