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Homework Help: Angular Momentum of a candy dish

  1. Nov 9, 2008 #1
    1. The problem statement, all variables and given/known data
    A candy dish that rotates is called a lazy susan. This lazy susan is a uniform disk (mass 0.876 kg, radius 0.244 m), rotating about the center of the disk on a frictionless bearing. Suppose a large bug of mass 35.9 g sits at rest at on the edge of the empty lazy susan, which is initially at rest. The bug now begins to walk along the circumference of the disk at 6.12 cm/s relative to the disk. Find ω, the angular speed of the lazy susan.

    2. Relevant equations

    I just need a hint... based on the information provided i think i need to work my way through the conservation of angular momentum.. ... any suggestion

    3. The attempt at a solution
  2. jcsd
  3. Nov 9, 2008 #2


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    Re: HW help

    Conservation of angular momentum is indeed the way to go.

    In this case what must the total angular momentum of the system (bug and disc) be?

    What is the angular momentum of the bug?

    Therefore, what must be the angular momentum of the disc?
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