Pre-Cal(Please Help)

1) For a person at rest, the velocity v (in liters per second) of air flow during a respiratory cycle is

V = 0.85 sin pi(t)/ 3

where t is the time in seconds. (Inhalation occurs when v > 0 and exhalation occurs when v < 0)

A) Find the time for one full respiratory cycle
B) Find the number of cycles per minute.

Please explain. I do not understand!! Thank You

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  1. The sin function is periodic ever 2PI radians.

    a)2PI=PI/3 T
    or T for one cycle=6 seconds
    b) how many 6 seconds are in one minute?

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    bobpursley

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