Rotational Energy of a baseball

[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.


Answer in K_rot_/K_tot


What the?! I am pretty lost on this one...

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

 

[rock.freak667]

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

Yes this will give the rotational ke of the ball.

 

[Lance WIlliam]

What is the Fraction of KE though?

 

[rock.freak667]

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