Although small, forces and mass flow are associated with coughing. Momentum is transferred out of the body as a stream of air is expelled from the lungs. Consider the system of the body for the...

Although small, forces and mass flow are associated with coughing. Momentum is transferred out of the body as a stream of air is expelled from the lungs. Consider the system of the body for the duration of the cough. Is this system open, closed, or isolated? What forces are present? Is the system steady-state or dynamic? Write a general momentum accounting equation for this occurrence, and discuss the relative magnitudes of the terms.