Schwarzschild Radius question.txt (redirected from Schwarzschild+Radius+question.txt)

The equation for Swarzschild’s radius, the size at which a mass can be considered a black hole, is: 

Rgrav = 2GM/c21 

1 http://casswww.ucsd.edu/archive/public/tutorial/GR.html 

Now, consider the sun for a moment. It has a mass of 1.98892 x1033kg. 

a) If it were to become a black hole, what size would it have to shrink to? 
b) The ‘typical’ black hole has a radius of about 30km. How many times larger than the sun’s mass 
would a ‘typical’ black hole be?