The center of mass of a pitched base ball (radius=3.8cm) moves at 38m/s. The ball spins about an axis through its center of mass with an angular speed of 125 rad/s. Calculate the ratio of the rotational energy to the translational kinetic energy. Treat the ball as a uniform sphere.(adsbygoogle = window.adsbygoogle || []).push({});

[tex]0.5Iw^2:0.5mv^2[/tex]

[tex]I=mr^2=m(.038m)^2=m0.001444[/tex]

[tex]0.5m0.001444(125rad/s)^2:0.5m(39m/s)^2[/tex]

[tex]22.5625:1444[/tex]

[tex]1:64[/tex]

is this correct?

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# Homework Help: Rotation energy

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