An isolated spherical star of radius $R_o$, rotates about an axis that passes through its center with an angular velocity of $\omega_o$. Gravitational forces within the star cause the star’s radius to collapse and decrease to a value $r_o

Question

An isolated spherical star of radius $R_o$, rotates about an axis that passes through its center with an angular velocity of $\omega_o$. Gravitational forces within the star cause the star&#8217;s radius to collapse and decrease to a value $r_o < R_o$, but the mass of the star remains constant. A graph of the star's angular velocity as a function of time as it collapses is shown. Which of the following predictions is correct about the angular momentum $L$ of the star immediately after the collapse?(a) $L$ will be greater after the collapse.
, (b) $L$ will be less after the collapse.
, (c) $L$ will be the same as before the collapse.
, (d) The magnitude of $L$ will be the same as before the collapse, but the direction of the angular momentum will be in the opposite direction after the collapse.
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