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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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Answer with Explanation:

We are given that

One food calorie=4KJ=[tex]4\times 1000=4000J[/tex]

1kJ=1000 J

Height,h=3 m

Mass,m=2500 kg

Energy required to lift the truck=[tex]mgh[/tex]

Where [tex]g=9.8m/s^2[/tex]

Using the formula

Energy required to lift the truck=[tex]2500\times 3\times 9.8[/tex]

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

If a food item gives 20 food calorie

Then, the energy obtained from food=[tex]20\times 4=80KJ[/tex]

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

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