The exercise machine consists of a rigid bar pin connected to the frame at A. As the woman pushes up on the bar it stretches the rubber band BC. If the stiffness of the rubber band is k = 500 lb/ft, determine the applied vertical force F needed to hold the bar in the position θ = 30°. The rubber band is upstretched when θ = 0°.

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5 ft B -1 ft A $0.5 ft C