Structure OABC is built in at point O and supports forces from two rabies. Cable EAD passes through a frictionless ring at point A and cable OCG passes through a frictionless ring at point C. If the force in cable EAD is 800 lb and the force in cable OCG is 400 lb. determine
(a) the moment of forces from cable OCG about point B.
(b) the moment of all cable forces about point A.
(c) the moment of all cable forces about point O.
Figure P4.20
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