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Math Help - [SOLVED] Vectors and Torque

  1. #1
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    [SOLVED] Vectors and Torque

    So the question asks: In each of the following diagrams, determine the magnitude of the moment of the force about the fixed point A.

    The diagrams can be found here:

    http://img54.imageshack.us/img54/1250/scan0003t.jpg

    For question: a) I got 1.75 by using the torque formula T = |r| |F| sin x (correct me if I am mistaken)

    B) I am not sure how to attempt. There are two distances to get to the force and angle of direction. Do i combine the distance and sub it into the formula using the force and angle stated in the diagram?

    c) I believe it is the same scenario as B, however the force and angle are different.

    How do i attempt question b and c?
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  2. #2
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    your scanned picture leaves much to be desired.

    4a. \tau = (0.1) \cdot 35\sin(120^{\circ})<br />

    4b. \tau = (0.5) \cdot 35\sin\left[30^{\circ} + \arctan\left(\frac{4}{3}\right)\right]

    4c. \tau = \sqrt{2} \cdot 100\sin(70^{\circ} + 45^{\circ})
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