MadSci Network: Astronomy

Subject: Collapsing star angular momentum converted to mass

Date: Tue Feb 20 21:10:14 2001
Posted by David
Grade level: undergrad School: UNO
City: Omaha State/Province: NE Country: USA
Area of science: Astronomy
ID: 982721414.As

  When light falls into a black hole, its energy is absorbed as a mass increase 
with corresponding increase in the event horizon.  Why not the rotational 
energy of matter in the collapsing star?  If a spinning top were thrown into a 
black hole, I don't picture its "immune" angular momentum being conserved. I 
would expect it to convert to "mass" instead of adding to/subtracting from the 
hole's rotation.  How does spinning matter in the top differ from the spinning 
matter in the star as it collapses?
  What is the "rpm" of an object with a radius of zero?  Seems like it should 
be infinite or zero.  So equal massed stars, one with fast rotation, one with 
almost none have the same rate of rotation when they become black holes?
  Clearly I'm not grasping some things here.  Thanks in advance for any input!

Re: Collapsing star angular momentum converted to mass

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