1. What is the orbital period of a bit of matter in an accretion disk 2 × 10 5 km from a…

1. What is the orbital period of a bit of matter in an accretion disk 2 × 105 km from a 10-solar-mass black hole? (Hint: Use the circular orbit velocity formula, Chapter 4.) 2. If an X-ray binary consists of a 20-solar-mass star and a neutron star orbiting each other every 13.1 days, what is their average separation? (Hints: Use the version of Kepler’s third law for binary stars, Chapter 13; make sure you express quantities in units of AU, solar masses, and years.)  

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