Calculate New Period of Star After Shrinking Diameter

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SUMMARY

The discussion focuses on calculating the new rotational period of a star after its diameter shrinks to 0.610 times its original size, given its mass of 1.170×1031 kg and an initial rotation period of 28.30 days. The key principle to apply is the conservation of angular momentum, which states that the product of the moment of inertia and angular velocity remains constant if no external torques act on the system. By using this principle, one can derive the new period of rotation after the diameter change.

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  • Understanding of angular momentum conservation
  • Familiarity with moment of inertia calculations
  • Basic knowledge of rotational dynamics
  • Ability to manipulate algebraic equations
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Astronomy students, astrophysicists, and anyone interested in stellar dynamics and rotational mechanics will benefit from this discussion.

joeypeter
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The mass of a star is 1.170×1031 kg and it performs one rotation in 28.30 day. Find its new period (in days) if the diameter suddenly shrinks to 0.610 times its present size. Assume a uniform mass distribution before and after.

How do I even start this problem? Can anyone give me step by step how to do this?
 
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Hi joeypeter! :smile:

We can give you one step:

Use conservation of angular momentum (what is it in this case?)
 

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