Problem 1. A particle is orbiting a star of mass M in a circular
orbit. (a, 2 POINTS) Find the equation that provides the orbital
speed at a given distance r from the center of the star. (b, 1
POINT) From the result at (a), calculate at what distance rS the
particle should be from the center of the star for its orbital
speed to be equal to the speed of light, c (in this case, the
particle would be...