- The moment of a couple is given by \( M = F \times d \), where \( F \) is the force and \( d \) is the perpendicular distance between the forces.
- Here, \( F = 21 \, \text{N} \) and \( d = 0.4 \, \text{m} \).
\[ M = 21 \, \text{N} \times 0.4 \, \text{m} = 8.4
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