For a Person at Rest, the Velocity V (In Liters $0.9 \sin \frac { \pi t } { 7 }$

question 23

Multiple Choice

For a person at rest, the velocity v (in liters per second) of air flow into and out of the lungs during a respiratory cycle is given by $0.9 \sin \frac { \pi t } { 7 }$ , 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.

• A) \(14 \pi\) seconds
• B) \(\pi\) seconds
• C)14 seconds
• D) \(2 \pi\) seconds
• E)7 seconds

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