Final answer:
To convert the energy used by the body in one day from Calories to joules, multiply the number of Calories by 4,184 joules per Calorie.
Step-by-step explanation:
The amount of energy used by your body in one day can be expressed in joules by converting the energy from Calories to joules. Since 1 Calorie (with a capital C) is equal to 4,184 joules, to find the total energy expenditure in joules, you would multiply the number of Calories your body uses in a day by 4,184. If, for example, your body uses 2,000 Calories in one day, the energy used would be 2,000 x 4,184 = 8,368,000 joules.