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Math Help - wire density

  1. #1
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    wire density

    Consider a wire in the shape of a helix with constant density function

    a) find the mass
    b) determine the coordinates of the center of mass
    c) determine the moment of inertia about the z-axis

    The one example I have seems to be quite different and I cant follow it anyway. Any help setting up this problem, I would appreciate.
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  2. #2
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    Joined
    Oct 2007
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    im still working on this
    i thought the answer may have been along these lines

    find r'(t). and then find the dot product with the density.
    then work out the integral from 0 to 2pi
    the integral changes back into the original r(t) equation, and by subbing in 2pi and then subtracting the substitution of 0 I ended up with 10pi, which is not the answer for the mass
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