Question: The A-frame is being hoisted into an upright position by the vertical force F. Determine the moment of this force about the y axis when

The A-frame is being hoisted into an upright position by the vertical force F.
Determine the moment of this force about the y axis when the frame is in the position shown.

Given:
F = 80 lb
a = 6 ft
b = 6 ft
θ = 30 deg
φ = 15 deg

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