Answer: 21.9 joules
Explanation:
Given: The amount of calories absorbed by an iron nail = 5.25
We know that 1 kilocalories =4184 joules
Using unitary method,
[tex]\text{1 calorie}=\dfrac{4184}{1000}\text{ joules}\\\\\Rightarrow\ \text{1 calorie}= 4.184\approx4.18\text{ joules}[/tex]
Now, to convert 5.25 calories into joules , multiply 5.25 by 4.18, we get
[tex] \text{5.25 calories}= 4.18\times5.25=21.945\approx21.9\text{ joules}[/tex]
