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Homework Help: Kinematic particle

  1. Sep 15, 2016 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    Formulas for a_r and a_theta.

    3. The attempt at a solution
    I got the second derative of r but I think the fluxie v is a mistake. I am sure that
    [itex] \dot{v} =a\ [/itex], right?
  2. jcsd
  3. Sep 15, 2016 #2


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    The statement of the question is rather unclear. If v is the velocity, dv/dt is a vector, but it doesn't ask about the direction. Maybe it means to ask for ##|\dot{\vec v}|##.
    The given acceleration appears to be the radial component only, so is not the same as either ##|\dot{\vec v}|## (the total acceleration) or ##\ddot r##.
  4. Sep 16, 2016 #3
    Yes but the radial acceleration is the total acceleration [itex]a =a _r [/itex] so it should be the same right?
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