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2 September, 22:48

A sleeping 68 kg man has a metabolic power of 65 w. you may want to review (pages 323 - 327). part a how many calories does he burn during an 8.0 hour sleep

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  1. 2 September, 23:16
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    Given:

    Mass = 68 kg

    Power = 65 W

    To determine:

    Calories burned during an 8.0 hr sleep

    Explanation:

    Energy is expressed as:

    Energy = Power * Time

    Now, the unit of power = Watt (W)

    1 W = 1 J/s i. e. 65 W = 65 J/s

    Time = 8 hrs = 8 * 3600 s = 28800 s

    Energy = 65 J/s * 28800 s = 1872000 J

    Convert Joules (J) to calories (cal)

    1 cal = 4.184 J

    The calculated energy = 187200 J * 1 cal/4.184 = 447418 cal

    Ans: The man burns nearly 447.4 kcal during an 8 hr sleep
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