Question

Please explain each step thanks :)

A pulsing star A of mass Ma orbits a black hole B of mass Mb. They are R meters apart.

1. What is the orbiting period if Mb>>Ma

2. Where is the barycenter

3. What is the time dilation caused by the black hole at "A"

4. If the observed (at earth) pulsar period is T. What is the actual period at "A"

5. How large can "A" be before it starts loosing mass to "B"

Answer 1