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Simple Physics question about rotational inertia

  1. Nov 25, 2009 #1
    1. The problem statement, all variables and given/known data
    A bowling ball made for a child has two thirds the radius of an adult bowling ball. They are made of the same material (and therefore have the same mass per unit volume).
    (a) By what factor is the mass of the child's ball reduced compared with the adult ball?

    (b) By what factor is the rotational inertia of the child's ball reduced compared with the adult ball?


    2. Relevant equations

    1/2 MR^2 , i believe

    3. The attempt at a solution
    I thought that the answer to part is is just 1/3 but my online assignment is accepting it as the correct answer.
    part b would then be 2/3 squared * 1/2 = 1/3
     
  2. jcsd
  3. Nov 25, 2009 #2
    (a) What is the formula for the volume of a sphere?
     
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