Rotation 2 Question 20

20. A binary star consists of two stars A (mass 2.2MS ) and B (mass 11MS ), where MS is the mass of the sun. They are separated by distance d and are rotating about their centre of mass, which is stationary. The ratio of the total angular momentum of the binary star to the angular momentum of star B about the centre of mass is

(2010)

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Answer:

Correct Answer: 20. (6)

Solution:

  1. LTotal LB=(IA+IB)ωIBω (as ω will be same in both cases)

=IAIB+1=mArA2mBrB2+1=rArB+1( as mArA=mBrB)=112.2+1=6 as r1m



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