Question

5.25 calories are absorbed by an iron nail. How many joules is this?

1.07
9.43
12.6
21.9

Answer 1

5.25= 21.966 that's the correct answer

Answer 2

Answer: 21.9 joules

Step-by-step explanation:

Given: The amount of calories absorbed by an iron nail = 5.25

We know that 1 kilocalories =4184 joules

Using unitary method,

`\text{1 calorie}=(4184)/(1000)\text{ joules}\\\\\Rightarrow\ \text{1 calorie}= 4.184\approx4.18\text{ joules}`

Now, to convert 5.25 calories into joules , multiply 5.25 by 4.18, we get

`\text{5.25 calories}= 4.18*5.25=21.945\approx21.9\text{ joules}`