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25 votes
Can you write the answer normally and also in Significant figures

Can you write the answer normally and also in Significant figures-example-1
User Omar Alshaker
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1 Answer

12 votes
12 votes

One Joule is the amount of energy generated by a power of one Watt in one second.

Knowing this, we can write the formula below:


E=P\cdot t

So, for an energy of 42000 J and a power of 1200 W, the time required is:


\begin{gathered} 42000=1200\cdot t \\ t=(42000)/(1200) \\ t=35\text{ seconds} \end{gathered}

The number of significant figures in the number 35 is two.

User Brett Mathe
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