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Physics

A uniform plank measures 2m long from it's end point A to point B. If the weight of the plank is 54N and it rests on a knife edge 0.50m from end B and point A and is supported by a vertical string so that AB balances horizontally.
1) Draw a force diagram for the arrangement.
2) Determine the tension T on the string.
3) Determine the force F acting on the knife edge.

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