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Revolutions and radius of wheel

  1. Nov 26, 2007 #1
    1. The problem statement, all variables and given/known data

    A string is wound tightly around a wheel. When the end of the string is pulled through a distance of ? cm, the wheel rotates through ? revolutions. What is the radius of the wheel?

    2. Relevant equations

    3. The attempt at a solution

    i'm confused about this simple problem because i believed that displacement and revolutions were the same for theta in a kinematics problem like this: theta = 1/2(w0 + w)t

    what equation would I use to solve such a problem.
  2. jcsd
  3. Nov 26, 2007 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    All you need is the relationship between circumference and radius. You get the circumference from the length of string pulled and the number of revolutions.
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