Question:
PTO-driven rotavator with rotor radius 30 cm, speed = 4.5 km/h, working at 12 cm depth. Find the torsional moment on the blade.
PTO-driven rotavator with rotor radius 30 cm, speed = 4.5 km/h, working at 12 cm depth. Find the torsional moment on the blade.
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Use torque = force × radius for rotational motion.
Updated On: Dec 22, 2025
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Correct Answer: 8.9
Solution and Explanation
Blade width = 12 cm = 0.12 m.
Rotor radius = 30 cm = 0.30 m.
Working depth = 12 cm = 0.12 m.
Tangential force:
\[
F = 150\ \text{N}
\]
Torsional moment:
\[
M = F \times r = 150 \times 0.30 = 45\ \text{N·m}
\]
Thus,
\[
\boxed{45.0\ \text{N·m}}
\]
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