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The rotational inertia of a collapsing spinning star drops from an initial value Ii= 9 x...

The rotational inertia of a collapsing spinning star drops from an initial value Ii= 9 x 1099 kg m2 to a value of If = 3 x 1099 kg m2.

(a) Ratio of final rotational kinetic energy (KEf) to the initial rotational KEi is ________

(b) What would that ratio be if If/Ii=1/4? ________

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