Rate of oxygen consumption while sleeping

[omc1]

Homework Statement

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?

Homework Equations

p=fv
f=mg

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?

 

[Borek]

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?

 

[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...

 

[AGNuke]

Is the answer is approximately 3.72 mL/sec?

 

[Borek]

i divided the power by force(mg) to find v

That's off.

my answer can be in mL/sec...

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

 

[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

 

[Jshua Monkoe]

@Nuke done, i think you're right