After Exercising for a Few Minutes, a Person Has a Respiratory

question 29

Multiple Choice

After exercising for a few minutes, a person has a respiratory cycle for which the velocity of airflow is approximated by $\pi$ $v = 1.75 \sin \left( \frac { \pi t } { 3 } \right)$ ,
Where t is the time (in seconds) .
(Inhalation occurs when v > 0 and exhalation occurs when v < 0.)

Find the time for one full respiratory cycle.

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