Physics Question? please help me!

Posted on 2014-12-08 07:14:00 in Physics by YELL

At the Galaxy's Core. Astronomers have observed a small, massive object at the center of a galaxy. A ring of material orbits this massive object; the ring has a diameter of about 15 light-years and an orbital speed of about 200 km/s.

(a) Determine the mass of the object at the center of the galaxy. Give your answer both in kilograms and in solar masses (one solar mass is the mass of the sun).

(b) Many astronomers believe that the massive object at the center of the galaxy is a black hole. If so, what must the Schwarzschild radius of this black hole be?

* I got 3.83e+38 kg for (a) and I dont know about mass of the sun and (c) also I don;y know how to do that!
Please help me!!!

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