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Questions on torque and cross products

  1. Mar 13, 2009 #1
    1. The problem statement, all variables and given/known data

    Hello. I have three questions on vector product that I am having problems with.
    I have attached the images for these questions.

    2. Relevant equations

    Vector Product:

    a x b = lal lbl sin (theta) n

    or i, j, k method

    Area of a triangle:

    (1/2) l a x b l

    Torque = l r x F l, where r = vector from force, F = force vector

    3. The attempt at a solution

    I am confused about these questions. I would really appreciate your help in understanding how to work them out.

    Thanks in advance.
     

    Attached Files:

  2. jcsd
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