Considering that a food calorie is equal to about 4 kJ of energy, you wonder how the amount of energy in a serving size of your favorite foo

Question

Considering that a food calorie is equal to about 4 kJ of energy, you wonder how the amount of energy in a serving size of your favorite food compares in other situations. For example, how does this compare to the amount of energy that’s necessary to lift a fully-loaded pickup truck up three meters above the ground? Let’s say the truck has a mass of 2500 kg.

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Thu Giang 4 years 2021-07-21T18:29:42+00:00 1 Answers 13 views 0

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  1. Cherry
    0
    2021-07-21T18:31:19+00:00
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    Answer with Explanation:

    We are given that

    One food calorie=4KJ=4\times 1000=4000J

    1kJ=1000 J

    Height,h=3 m

    Mass,m=2500 kg

    Energy required to lift the truck=mgh

    Where g=9.8m/s^2

    Using the formula

    Energy required to lift the truck=2500\times 3\times 9.8

    Energy required to lift the truck=73500J=\frac{73500}{1000}=7.35KJ

    If a food item gives 20 food calorie

    Then, the energy obtained from food=20\times 4=80KJ

    Which is greater than the energy required to lift the truck.

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