Step 1: Understanding the Concept:
This question asks for the average power output that can be sustained by a female agricultural worker over a full workday. This is a topic in ergonomics and farm power, which studies the capabilities of human and animal power sources.
Step 2: Detailed Explanation:
1. The power output of a human depends on the individual's health, nutrition, the type of work being done, and the duration of the work.
2. For sustained work over a long period (like an 8-10 hour workday), the average power output is significantly lower than the peak power a person can generate for short bursts.
3. Standard ergonomic data for agricultural work provides average power output figures for different types of workers.
4. A healthy adult man can sustain an average power output of about 75 Watts (approximately 0.1 horsepower) over a workday.
5. A woman, on average, has a slightly lower sustained power output. The commonly accepted value in agricultural engineering is approximately 2/3 to 4/5 of a man's output.
6. A typical value cited for an average woman agricultural worker is around 60 Watts.
7. Let's analyze the options based on these standard figures:
- 75W is the standard value for an average man.
- 55W, 60W, and 70W are all in the plausible range for a woman. However, 60W is a very commonly cited average figure in textbooks and ergonomic studies for this context.
Step 3: Final Answer:
Based on established ergonomic data for agricultural labor, an average woman worker develops nearly 60W of power over a sustained workday. Therefore, option (B) is the correct answer.