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Math Help - Tension in the wire

  1. #1
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    Tension in the wire

    A mass of 50 Kg is suspended from the top in of the pole that is inclined 40 degrees to the vertical. the end of the pole is supported by a wire that is making an angle of 75 degrees with the pole.
    What is the tension in the wire?

    http://img833.imageshack.us/img833/1038/diagramxf.png
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    Re: Tension in the wire

    Quote Originally Posted by Clairvoyantski View Post
    A mass of 50 Kg is suspended from the top in of the pole that is inclined 40 degrees to the vertical. the end of the pole is supported by a wire that is making an angle of 75 degrees with the pole.
    What is the tension in the wire?

    http://img833.imageshack.us/img833/1038/diagramxf.png
    Let length of pole = L
    Taking moments about the foot of the pole T*Lsin75=50*Lsin40
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    Re: Tension in the wire

    Can you elaborate?
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    Re: Tension in the wire

    The moment of a force about a point is the product of the force and the perpendicular distance from the point to the line of the force. When a system is in equilibrium the sum of clockwise moments = the sum of anticlockwise moments
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    Re: Tension in the wire

    What do I do next?
    Thanks and Regards,
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    Re: Tension in the wire

    ... click on the sketch
    Attached Thumbnails Attached Thumbnails Tension in the wire-statics1.jpg  
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    Re: Tension in the wire

    Yes, but then I dont know the value of L!
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    Re: Tension in the wire

    Quote Originally Posted by Clairvoyantski View Post
    Yes, but then I dont know the value of L!
    you don't need the value of L ... its value cancels out as it is a common factor on both sides of the equation.

    LOOK at the equation on the sketch once again.
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