One third of vanilla ice cream provides about 145 kcal of energy. A typical adult uses about 195...

Question:

One third of vanilla ice cream provides about {eq}145 \, \mathrm{kcal} {/eq} of energy. A typical adult uses about {eq}195 \, \mathrm{kcal/hr} {/eq} of energy while walking. If all of the energy in one third of a cup of vanilla ice cream were to be burned off by walking, how many minutes would it take for this energy to be used?

Using the energy:

We are well aware of the fact that energy can't be created nor destroyed. So, as a warm-blooded creature, we consume food to produce energy for day-to-day work. The chemical energy from the food gets converted into energy that our body needs.

Answer and Explanation:

It is given that to burn 195 kcal, a typical adult takes 1 hr (60 min). To burn 1 kcal, the time it will take is

{eq}\begin{align*} t_0 = \frac{60}{195}\ min \end{align*} {/eq}

To burn 145 kcal, it will take

{eq}\begin{align*} &t = t_0\cdot 145\\ \Rightarrow & t = \frac{60}{195}\cdot 145\\ \Rightarrow & t = \frac{580}{13}\\ \Rightarrow & t = \approx 44.6\ min \end{align*} {/eq}

Conclusion

It would take 44.6 min to use that much of energy.


Learn more about this topic:

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What is Energy Conservation? - Lesson for Kids

from Science for Kids

Chapter 11 / Lesson 29
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