3.28 a person uses 750 kcal on a long walk. calculate the energy used for the walk in each of the following…
3.28 a person uses 750 kcal on a long walk. calculate the energy used for the walk in each of the following energy units: a. joules b. kilojoules
Answer
Explanation:
Step1: Recall conversion factor
1 kcal = 4184 J
Step2: Convert kcal to joules for part a
$750\ kcal\times4184\ \frac{J}{kcal}=3138000\ J$
Step3: Recall conversion from joules to kilojoules
1 kJ = 1000 J
Step4: Convert joules to kilojoules for part b
$\frac{3138000\ J}{1000}=3138\ kJ$
Answer:
a. 3138000 J b. 3138 kJ