Extremely heavy work is about ______ BTU/hr?

Extremely heavy work is about ______ BTU/hr?

• A. 1,000 BTU/hr
• B. 2,000 BTU/hr
• C. 3,000 BTU/hr
• D. 5,000 BTU/hr

Answer: (B)

Extremely heavy work is assessed by how much heat the body generates per hour during intense effort and then expressed in BTU per hour for practical calculations. A very heavy level of activity roughly corresponds to about 500 kilocalories burned per hour. Converting that to BTU per hour using 1 kilocalorie per hour ≈ 3.968 BTU/hr gives about 1,984 BTU/hr, i.e., roughly 2,000 BTU/hr. That makes the option around 2,000 BTU/hr the best fit for extremely heavy work. Other values would align with lower or higher activity levels, but not with the common benchmark for extremely heavy effort. For example, about 1,000 BTU/hr would reflect a much lower metabolic rate (around 250 kcal/hr), while 3,000–5,000 BTU/hr would imply even higher energy outputs than typical extremely heavy work.

Extremely heavy work is assessed by how much heat the body generates per hour during intense effort and then expressed in BTU per hour for practical calculations. A very heavy level of activity roughly corresponds to about 500 kilocalories burned per hour. Converting that to BTU per hour using 1 kilocalorie per hour ≈ 3.968 BTU/hr gives about 1,984 BTU/hr, i.e., roughly 2,000 BTU/hr. That makes the option around 2,000 BTU/hr the best fit for extremely heavy work.

Other values would align with lower or higher activity levels, but not with the common benchmark for extremely heavy effort. For example, about 1,000 BTU/hr would reflect a much lower metabolic rate (around 250 kcal/hr), while 3,000–5,000 BTU/hr would imply even higher energy outputs than typical extremely heavy work.