Posted by **Ace** on Monday, March 8, 2010 at 9:33pm.

A solid disk rolls along the floor with a constant linear speed v.

(a) 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 = ?

- Physics -
**bobpursley**, Monday, March 8, 2010 at 10:06pm
Total KE=rotaionalKE + linearKE

= 1/2 momentInertia*(v^2/r^2) + 1/2 mass*v^2

- Physics -
**drwls**, Monday, March 8, 2010 at 10:11pm
The rotational KE is

(K.E.)rot = (1/2) I w^2

The angular velocity is w = V/R

The moment of inertia is (1/2) M R^2 for a solif disc.

Express (K.E.)rot in terms of M and V.

Then calculate

(K.E.)rot/[(1/2 M V^2 + (K.E.)rot]

That will be the answer.

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