Force $F$ Is Applied at D Along Line DB and Couple $\boldsymbol { M }$

question 9

Multiple Choice

Force $F$ is applied at D along line DB and couple $\boldsymbol { M }$ is perpendicular to plane ABC. Assume magnitudes F = 20 lb and couple M = 50 in-lb. The moment $\boldsymbol { M } \boldsymbol { A } \text { (in-lb) due to both } \boldsymbol { F } \text { and } \boldsymbol { M } \text { is: }$

• A) \(37 \boldsymbol { i } - 60 \boldsymbol { j } + 22 \boldsymbol { k }\)
• B) \(- 37 i - 60 j - 22 k\)
• C) \(- 37 i - 60 j - 22 k\).
• D) \(- 60 i - 37 j - 22 k\)

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