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Angular Momentum of a wheel

  1. Nov 21, 2005 #1
    A wheel is rotating freely with an angular speed of 800 rev/min on a shaft whose rotational inertia is negligible. A second wheel, initially at rest and with twice the rotational inertia of the first, is suddenly coupled to the same shaft. What is the angular speed in rev/min of the resultant combination of the shaft and two wheels? What fraction of the original rotational kinetic energy is lost?

    I don't know what "coupled to the shaft" means. How are they connected?
  2. jcsd
  3. Nov 21, 2005 #2


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    Homework Helper

    "Coupled" is a fancy term used in science and engineering to mean connected in a proper way. Hint: the question is testing you on your understanding of the conservation of angular momentum.
  4. Nov 21, 2005 #3
    thanks! i got it
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