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Function: require_once
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Function: require_once
2.6 When force \( P \) is applied to the rigid arm \( A B C \), point \( B \) displaces vertically downward through a distance of \( \mathbf{0 . 2 ~ m m} \). Determine the normal strain in wire \( \boldsymbol{C} \boldsymbol{D} \).
