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&#8217;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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Jason · Accepted Answer

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