# Rate of oxygen consumption while sleeping

1. Oct 9, 2012

### omc1

1. The problem statement, all variables and given/known data The oxygen taken in by the body reacts with fats, carbohydrates, and protein, liberating energy internally at a rate of about 2.180×104 J/L. If a 71.40 kg man requires 81.00 W of power even while sleeping, what is his rate of oxygen consumption?

2. Relevant equations p=fv
f=mg

3. The attempt at a solution i found a value for v but iam not sure how the internal energy plays into the answer??? the value i got for v is wrong so iam not sure if i did the problem wrong or if it has to do with the other rate?

2. Oct 9, 2012

### Staff: Mentor

Show what you did and how yo got the (incorrect) value. It is not clear to me what should be the unit of your answer - L/min? mL/sec? Something else? These can be easily interconverted though.

81 W - how many J per second? How many liter of oxygen per this number of J?

3. Oct 9, 2012

### omc1

i divided the power by force(mg) to find v but i see that i would need to cancel the jouls out. my answer can be in mL/sec....

4. Oct 9, 2012

### AGNuke

Is the answer is approximately 3.72 mL/sec?

5. Oct 10, 2012

### Staff: Mentor

That's off.

OK. Follow the reasoning from my previous post - have you at least tried to understand it?

6. Oct 10, 2012

### omc1

oh i see the watt is equal to J/s and the initial rate in J/ml is 21.8 so i just divide to get ml/s. thanks

7. Jan 2, 2013

### Jshua Monkoe

@Nuke done, i think you're right