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Rotational Energy of a baseball

  1. Jul 23, 2008 #1
    A 250 g baseball is pitched at 35 m/s, and it's spinning at 55rad/s .

    What fraction of its kinetic energy is rotational? Treat the baseball as a uniform solid sphere of radius 3.8 cm.

    Answer in K_rot_/K_tot

    What the?! Im pretty lost on this one....

    Do I use K_rot_=(1/2)[tex]I[/tex][tex]\omega[/tex]^2
  2. jcsd
  3. Jul 23, 2008 #2


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    Yes this will give the rotational ke of the ball.
  4. Jul 23, 2008 #3
    What is the Fraction of KE though?
  5. Jul 23, 2008 #4


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    The total energy of the ball is [itex]\frac{1}{2}mv^2[/itex]
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