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Homework Help: Calc 3 curvature verification

  1. Oct 19, 2014 #1
    1. The problem statement, all variables and given/known data
    verify that |T ' (s)| = |T ' (t)| / |r ' (t)|

    2. Relevant equations
    K = |dT / ds|

    K = |r'(t) x r''(t)| / |r'(t)|^3 the x is a cross product

    3. The attempt at a solution
    I don't know how to start this problem because one side of the verification is in terms of arc length and the other side is in terms of time. Could some one help me get the ball rolling and explain how I get both sides in terms of the same parameter
  2. jcsd
  3. Oct 19, 2014 #2


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    Science Advisor
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    Gold Member

    Your relevant equations aren't relevant. Use the chain rule to get ##T'(s)## in terms of ##t##.
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