Final answer:
To convert the energy an average adult human burns per day from kcal to kJ per hour, multiply the daily expenditure by 4.184 to get kJ, then divide by 24 hours, resulting in approximately 348.67 kJ per hour.
Step-by-step explanation:
The average adult human's daily energy expenditure can be converted from kilocalories to kilojoules per hour to determine their energy usage rate. First, we know that 1 kcal equals approximately 4.184 kJ. Therefore, 2.00 × 103 kcal/day is equivalent to 2.00 × 103 × 4.184 kJ/day, which is 8.368 × 103 kJ/day. To find the rate in kJ per hour, we divide this number by the total number of hours in a day. Since a day has 24 hours, the calculation would be 8.368 × 103 kJ/day ÷ 24 hours/day, resulting in a rate of approximately 348.67 kJ/hour.