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Rotational inertia of a rod that has mass on one end

  1. Apr 9, 2015 #1
    1. The problem statement, all variables and given/known data
    a 3 kg mass is on the end of a metal rod which is pivoted at one end. the mass of the rod is 2kg its length is 4 meters

    2. Relevant equations
    I=(ML^2)/3

    3. The attempt at a solution
    the rotational inertia of the rod itself is 10.6 but i dont know how the 3kg mass at the end would effect things
     
  2. jcsd
  3. Apr 9, 2015 #2

    PhanthomJay

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    Assuming the mass at the end has negligible size , what is the I of a particle of mass m about a pivot point , and then note the I of the rod-mass system is the sum of the I's of its parts.
     
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