(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...

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Energy conversion- burning wood to lifting an object

**Physics Forums | Science Articles, Homework Help, Discussion**