The resultant force of a wind loading acts perpendicular to the face of the sign as shown. Replace this force by an equivalent force and couple moment acting at point O.

1. 

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The resultant force of a wind loading acts perpendicular to the face of the sign as shown. Replace this force by an equivalent force and couple moment acting at point O.
[A]. F = -120i lb, M = (-3000j+1800k) lb-ft
[B]. F = -120i lb, M = 3500i lb-ft
[C]. F = -120i lb, M = -3500j lb-ft
[D]. F = -120i lb, M = 3500k lb-ft

Answer: Option A

Explanation:

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