Question

Can you write the answer normally and also in Significant figures

Answer 1

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.