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Homework Help: 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
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    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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