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18 September, 17:33

Normally the rate at which you expend energy during a brisk walk is 3.6 Calories per minute. (A Calorie is the common unit of food energy, equal to 4184.1 J.) How long do you have to walk to produce the same amount of energy as a 150 W lightbulb that is lit for 5.8 hours?

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  1. 18 September, 19:54
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    3.5 hour

    Step-by-step explanation:

    During a brisk walk, rate at which energy is expended is P (expend) = 3.6 calories per min

    1 calorie = 4184.1 J

    Energy produced by bulb is P (bulb) = 150W

    time = 5.8 hrs

    Convvert 5.8 hrs to secs. we have

    t = 5.8*3600

    t = 20880 secs

    Power = Energy/time

    150 = energy / 20880

    Energy = 150 * 20880

    = 3132000J

    Convert the rate at which cv h energy is expended into joules per second, we have

    (3.6 * 4184.1) / 60

    P (expend) = 251J/s

    = 251W

    Recall that P = E/t

    t = E/p

    t = 3132000/251

    t = 12478 secs

    Convert secs to hour

    t = 12478 / 3600

    t = 3.5 hours

    The time requtied to produce the s/me amount of energy as 150W bulb that lights up 5 ... 8hrs is t = 3.5 hrs
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