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Why spin angular velocity of a star is greatly enhanced when it collapses under gravitational pull and becomes a neutron star ?
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## QuestionPhysicsClass 11

Why spin angular velocity of a star is greatly enhanced when it collapses under gravitational pull and becomes a neutron star ?

On collapsing under gravitational pull, size of star decreases. Therefore, its moment of inertia decreases. As angular momentum $${\left({L}={I}\omega\right)}$$ is conserved, and $${I}$$ decreases, therefore, spin angular velocity $$\omega$$ increases.