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A uniform rod of weight 5N and lenght 1m is pivoted at a point of 20 cm from one of its ends. A weight is hung from the other end so that te rod balances horizontally. What is the value of the weight?

How do I find it if I don't know the weight at the other end?

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  1. sum moments about any point.
    Lets sum moments near where the weight is.

    W*0 + 5*.5 - (W+5)*.2=0

    solve for w, in newtons.

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