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PeachBanana

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## Homework Statement

A bowling ball of mass 7.2 kg and radius 9.1 cm rolls without slipping down a lane at 3.0 m/s.

What is the total kinetic energy of the bowling ball?

## Homework Equations

KE rot. = 1/2 Iω^2

## The Attempt at a Solution

KE initial = 0 J (I'm assuming it started from rest).

I = 2/5 (7.2 kg)(0.091 m)^2

I = 0.0238492 kg * m^2

I used the formula for a uniform sphere to calculate this.

3.0 m/s / 0.091 m = 0.3296 rad./s

KE final = 1/2 (0.0238492 kg*m^2)(0.3296 rad./s)^2

KE final = 1.3 * 10 ^ -3 J

I'm thinking I messed up at the "I" variable because my answer is tiny.

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