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Homework Help: Differentiating a vector

  1. Nov 18, 2007 #1
    1. The problem statement, all variables and given/known data

    Differentiate:

    v = 2at x + 3bt^2 y + cz

    w.r.t time to get a

    where x, y and z are unit vecotrs and should have hats above them

    2. Relevant equations



    3. The attempt at a solution

    I get a = 2a x + 6bt y + z

    But im not sure if that z should completely disappear or not?
     
  2. jcsd
  3. Nov 18, 2007 #2

    dynamicsolo

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    Homework Helper

    If c is a constant, then the derivative will be zero for the z component. (After all, the original specification for v says that the vector field everywhere has a constant z-component and hence a constant inclination to the xy-plane.)
     
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