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April 25, 2015

Homework Help: Physics (Rotational Kinetic Energy)

Posted by Ben on Wednesday, October 21, 2009 at 9:29pm.

Hello,

The question is: A solid ball rolls along the floor with a constant linear speed v. Find the fraction of its total kinetic energy that is in the form of rotational kinetic energy about the center of the ball.

Krot/Ktotal = ?

The answer I keep getting is 3/1, but the online homework system says "Your response differs from the correct answer by orders of magnitude.". I know the I for a solid sphere is I = 2/3 mr^2, but I'm still stuck.

Thank you for the help.

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