Question

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

Answer 1

Answer : 5.25 Calories is equivalent to 21.966 Joules.

Explanation :

The capacity to do any work is called its energy. Its SI unit is joules. Another unit of energy is joules.

The relation between the calorie and the joule is :

`1\ calorie=4.184\ J`

To convert 5.25 calories to joules we have to use unitary method i.e.

`5.25\ calories=5.25* 4.184\ J`

So, 5.25 C = 21.966 Joules.

Hence, this is the required solution.

Answer 2

1 kilo-calorie= 4184 joules
0.001 kilo-calorie= 1 calorie

therefore 5.25 calorie=21.966 joules