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Homework Help: Angular speed

  1. Apr 30, 2010 #1
    A large turntable rotates about a fixed vertical axis, making one revolution every 5.00 s. The moment of inertia of the turntable about its axis is 1.10e+03 kgm2. A man of mass 85.0 kg initially standing at the center of the turntable runs out along a radius. What is the angular speed of the turntable when the man is 2.00 m from the center? (As usual, assume that the man can be treated as a particle.)
    ________ rad/s

    For this problem what equations should i use?
     
  2. jcsd
  3. Apr 30, 2010 #2

    rock.freak667

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    Well the system is rotating and then a man stands on the disc...so what quantity is conserved?
     
  4. Apr 30, 2010 #3
    is angular momentum conserved and if so how would that apply
     
  5. Apr 30, 2010 #4

    rock.freak667

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    Well the system is rotating without the man, so what is the initial angular momentum?

    When the man is on the disc, what is the new total moment of inertia?
     
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