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Homework Help: Moment of Inertia textbook workings don't make sense.

  1. Nov 20, 2012 #1
    1. The problem statement, all variables and given/known data
    Question is about buckling, so i know i need to work out I (moment of Inertia), which is for a hollow tube.

    2. Relevant equations
    So the paper states..I = (0.08^4 - 0.06^4)∏/64 = 1.37 x 10^-6 m4

    When i do that on my calculator, i dont get this answer. Puzzled...
  2. jcsd
  3. Nov 20, 2012 #2


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    Staff Emeritus
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    Homework Helper

    Re: Moment of Inertia textbook workings dont make sense.

    The answer is correct.

    Probably mispunched a number. If you don't get the right resultinitially, try the calculation again.
  4. Nov 20, 2012 #3
    Re: Moment of Inertia textbook workings dont make sense.

    What a plonker i am, i have been doing 0.08 x10^4 instead of 0.08^4 .. Can you tell i have just started studying again since school.
    Thanks SteamKing - look out for more amateurish questions coming your way..haha.
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