Rotational Energy

1. Jul 23, 2008

Lance WIlliam

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.

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

Do I use K_rot_=(1/2)$$I$$$$\omega$$^2

2. Jul 23, 2008

rock.freak667

Yes this will give the rotational ke of the ball.

3. Jul 23, 2008

Lance WIlliam

What is the Fraction of KE though?

4. Jul 23, 2008

rock.freak667

The total energy of the ball is $\frac{1}{2}mv^2$