$(4-71)$ The A$-$frame is being hoisted into an upright position by the vertical force $F=100lb.$

Determine the moment of this force about the $y^{\text{'}}-$axis when the frame is in the position

shown.

$(4-72)$ For the same A$-$frame as the previous problem, it is being lifted by avertical force $F=$

$80$ lb $.$ Determine the moment of this force about the x $-$axis and about the y $-$axis $(2$ different

calculations$)$ when the frame is in the position shown.