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Homework Help: Vector question. care travels around a track . . .

  1. Sep 6, 2008 #1
    1. The problem statement, all variables and given/known data

    a car travels around a track at a speed of 5 rev/s. the track begins with a radius of 35m and spirals such that the radius increases 5m/rev. give the speed and position of the car as functions of time. express your answers as polar vectors.

    2. Relevant equations

    3. The attempt at a solution

    i dont get how to do it since the radius increases.
  2. jcsd
  3. Sep 6, 2008 #2


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    Staff Emeritus
    Science Advisor

    How about assuming constant angular momentum?

    And one knows r as a function of theta, assuming the radius increases uniformly as it sweeps through one revolution (2pi or 360°).
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