Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Finding the moment of intertia

  1. Feb 16, 2010 #1
    1. The problem statement, all variables and given/known data
    A solid sphere of mass 2 kg and 5 m radius is in space. Find its moment of inertia.

    2. Relevant equations2
    moment of inertia of a solid sphere about its diameter: [tex]\frac{2}{5}[/tex]MR2, where M is the mass of the sphere and R is its radius.

    3. The attempt at a solution
    I = mr^2 = (2 kg)(25 m^2) = 50 kgm^2

    Is that right, or am I totally out to lunch? Seems too easy.
    Last edited: Feb 17, 2010
  2. jcsd
  3. Feb 16, 2010 #2


    User Avatar
    Homework Helper

    Yes that looks correct to me.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook