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Math Help - the 2nd last one I need help with Gravity and Equilibrium

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    the 2nd last one I need help with Gravity and Equilibrium

    A folding catwalk of uniform density and length 3r is attached to a wall by a hinge. At the other end it is supported by a cable which makes an angle of above the horizontal. If a person of mass m stands a distance r from the wall what is the tension, T, in the support cable? The gravitational field is a constant g and the mass of the catwalk itself is 2m.

    [To enter the angle in the formula use the name 'theta' (without quotes).]
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