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A uniform rod pivoted at one end (point O) is free to swing in a vertical plane in a grav- itational field, held in equilibrium by a force F at its other end. The rod of length 7 m and weight 4.7 N makes an angle 39◦ with the hor- izontal and the force an angle of 54◦ with the horizontal

What is the magnitude of the force F ?

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