垂直力 120 N 作用於桿件的端點 A 處，如圖所示。請問此 120 N 作用力對 O 點的力矩(moment)為何？(註：sin60° = 0.866 ，cos60° = 0.5 ) (A-58題庫

3.垂直力 120 N 作用於桿件的端點 A 處，如圖所示。請問此 120 N 作用力對 O 點的力矩(moment)為何？(註：sin60° = 0.866 ，cos60° = 0.5 )
(A)1500 Nm
(B) 1780 Nm
(C) 2250 Nm
(D) 2550 Nm

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