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Homework Help: Rotational Inertias of Different Shapes

  1. Dec 7, 2013 #1
    Sorry, this isn't a question from a book or something, but I wasn't sure where else to put this. Is there a convenient way of memorizing or deriving the following?:


    I have an exam in a week and I thought I might as well try asking before making flashcards.
  2. jcsd
  3. Dec 7, 2013 #2
    Well, you can see, how the inertia is defined by an integral here:

    So basically, it's just about putting up the correct integral and solve it. I did not, however, ever need to actually derive one of them through any of my physics studies. If your teacher hasn't done it, I doubt you will be asked to. If you cannot use books or anything for the exam, I would believe, that an equation for the inertia needed for the specific body will surely be given.
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