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Help with Statics?

  1. Nov 19, 2014 #1
    I'm sort of self-teaching statics. Failing to see why when they sum moments around A, the force Fbc is coming in at an angle (and hence being multiplied by the 5/13). Can someone please clarify?

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  3. Nov 19, 2014 #2

    Simon Bridge

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    Welcome to PF;
    The question asks to calculate the moments etc "at a section passing through point E".
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