The energy content of food is usually given in Calories. One Calorie is equal to 4186 J. Suppose a person uses 2000 Calories in a day to keep his vital organs functioning.
(a) How much energy in joules is used?
(b) What is his rate of energy consumption?
(a) The energy used in joules is 8,372,000 J.
(b) The rate of energy consumption is 8,372,000 J/day.