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I do not understand how to do one of my online homework questions:
What is the Schwarzschild radius of a 100 million-solar-mass black hole? The mass of the Sun is about 2 × 1030 kg, and the formula for the Schwarzschild radius of a black hole of mass M is:
R=2GMc2, where G=6.67×10−11m2kg×s2; c=3×108m/s. The choices are: 300 million km 3 million km 3,000 km 3 km 30 km

Respuesta :

just plug in the figures: 

R = 2GM/c^2 
= (2)(6.67*10^-11)(100*10^6*2*10^30) / (9*10^16) 
= 3*10^11 m 
= 3*10^8 km 
= 3*10^2 million km 
= 300 million km

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