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19 April, 21:35

Breathing is cyclic and a full respiratory cycle from the beginning of inhalation to the end of exhalation takes about 7 s. the maximum rate of air flow into the lungs is about 0.3 l/s. this explains, in part, why the function f (t) = 3 10 sin (2πt/7) has often been used to model the rate of air flow into the lungs. use this model to find the volume of inhaled air in the lungs at time t.

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  1. 19 April, 21:40
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    In this problem, volume is computed:

    volume = ∫ (flow rate) ·dt

    ... = ∫[0, t] (3/10) * sin (2πt/7) ·dt

    = (3 / 10) * (7 / (2 π)) * (-cos (2 π t/7) + 1)

    = (-21 / (20 π)) * (cos (2 π t / 7) - 1)

    Volume is equal to 21 sin^2 (pit/7) / 10pi is the inhaled air in the lungs at time t
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