Question: A door is hinged on the aa - axis as shown in Figure 3 . ( a ) Determine the magnitude of the moment produced

A door is hinged on the aa-axis as shown in Figure 3.
(a) Determine the magnitude of the moment produced by the force F_(c)=250N about the hinged axis of
the door.
(b) If cable CB can be changed to DB or DO, choose the suitable combination for the cable in order to
produce the minimum possible moment about the hinged axis of the door. Justify your answer with
calculation.
I need guide how to solve b.
A door is hinged on the aa - axis as shown in

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