Torque Question - Help!!

[Mountaineurons]

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Boards X and Y are both massless and 4 m in length. A 4 N force is applied to board Y. Board X is held stationary. The two boards are nailed together at 1 m from the left end of board Y. If the boards do not move, what is the static frictional force between the nail and board X?

From ExamKrackers Physics Book Lecture 3 pg 42, #61