An $7\mathrm{.}9-cm-$diameter, $330$ g solid sphere is released from rest at the top of a $1\mathrm{.}6-m-$long, $20$ incline. It rolls, without slipping, to the bottom.

Part A

What is the sphere's angular velocity at the bottom of the incline?

Express your answer in radians per second.

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Part B

What fraction of its kinetic energy is rotational?

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$\frac{K_{\text{r}\text{o}\text{t}}}{K_{\text{t}\text{o}\text{t}\text{a}\text{l}}}=$