(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

If the calorific value of wood is 16 MJ/kg and a match weights approximately 0.17 g, then (a)

how much energy (in joules) is released by burning the wooden part of a single match? If all

of this energy were applied to do work to lift a 60 kg human vertically, against gravity, then

(b) how high could the person be lifted?

2. Relevant equations

W=F*d

F=ma

3. The attempt at a solution

So for a. I was given the calorific value for a kg of wood. So I crossed multipled and divide.

(16 MJ/kg*.00017kg) /1= 2720 J

then for B.

Joules can also be expressed in Nm

using formula W=F*d ->W/F=d

I was confused at first about the 80 kg because I assumed that was his weight but I am using that number as his mass. So found out that 80kg of mass= 588 N

w=2720Nm F= 588 N

2720Nm/588N= 4.626 m

Now does that seem a lot to you? It did at first but now I am not sure.

Please let me know if I am on the right track. This whole answer hinges on if I got the first part right... it seemed too easy so thats why i am second guessing myself...

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# Energy conversion- burning wood to lifting an object

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