---
title: "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 < 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?"
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url: "https://nerd-notes.com/ubq/28836/"
date_modified: "2026-01-17T22:38:35+00:00"
---

# 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 \( r_o < R_o \), 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?

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 \( r_o < R_o \), 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?

![Diagram](https://nerd-notes.com/wp-content/uploads/2024/03/ang-vel-of-star-1024x564.png)

- **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.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/28836/*