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We need about 1 L of oxygen per minute to maintain our resting metabolism and about...

We need about 1 L of oxygen per minute to maintain our resting metabolism and about 2.2 L when standing and walking. Let the air intake per breath be 0.40L.

Part A

Estimate the number of breaths per minute for a person to satisfy this need when resting. Remember that oxygen is about 21% of the air. Express your answer using two significant figures.

Part B

Estimate the number of breaths per minute for a person to satisfy this need when standing and walking. Express your answer using two significant figures.

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Answer #1

Part A The oxygen needed to maintain the metabolism is 1L/min The oxygen needed for standing and walking is 2.2 L/min The oxygen per breath is (oxygem) per breath 100 21 -0.40_ = 0.084 L 1 breath0.084 I Therefore, the number of breaths is, 1 L 0.084 -11.90 breaths/min Part B For standing and walking, the number of the breaths is 2.2L 0.084 26.190 breaths/min

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