Final answer:
One barrel of crude oil contains about 6.1 GJ of energy, which is equivalent to 1691.8 kWh. Therefore, one barrel of oil can produce approximately 0.58 kWh of energy per hour.
Step-by-step explanation:
One barrel of crude oil contains about 6.1 GJ of energy. To calculate the number of man hours of energy produced by one barrel of oil, we need to convert GJ to kWh. 1 GJ is equal to 278 kWh, so 6.1 GJ is equal to 1691.8 kWh.
Now, we need to calculate the number of man hours. Let's assume that one person works for 8 hours a day. In a year, there are approximately 365 days. So, in total, one person works for 2920 hours (8 hours/day x 365 days).