Step 1: Understanding the Concept:
This question asks for the typical sustained power output of a single medium-sized bullock (a castrated male bovine used as a draft animal). This is a standard value in the study of animal power in agriculture.
Step 2: Detailed Explanation:
1. The power developed by a draft animal depends on its species, breed, size, health, and the speed at which it works.
2. A general rule of thumb is that a draft animal can exert a continuous draft force equal to about 10-12% of its body weight.
3. Power is calculated as Power = Draft Force $\times$ Velocity.
4. For a medium-sized bullock (weighing around 300-400 kg), the sustainable draft is about 30-50 kgf (or roughly 300-500 N).
5. They typically walk at a speed of about 3-4 km/h (or around 1 m/s).
6. Calculating the power: Power $\approx$ (400 N) $\times$ (1 m/s) = 400 Watts.
7. Standard textbook values state that a single medium bullock can develop power in the range of 0.5 to 0.75 horsepower (hp).
8. Converting horsepower to watts (1 hp $\approx$ 746 W):
- 0.5 hp = 0.5 $\times$ 746 W $\approx$ 373 W.
- 0.75 hp = 0.75 $\times$ 746 W $\approx$ 560 W.
9. This calculated range is approximately 370-560 W.
10. Let's examine the options. The range 360-550W (option D) is the one that best matches these standard, accepted values for a single bullock.
11. A pair of bullocks is famously rated at approximately 1 horsepower (or 750 W), so a single bullock would be around half of that, which further supports the chosen range.
Step 3: Final Answer:
A medium size bullock can develop a sustained power output in the range of 360-550W. Therefore, option (D) is the correct answer.