2 massive black holes collided and released the equivalent energy of 3 solar masses.

Question

 

Energy released: E =mc2

=[3(1.99 x 1030)kg](3.00 x 108 m/s)2

= 5.373 x 1047 J

 

compare the energy released to that of a 1 megaton nuclear bomb (how many times more powerful the release was) 

Answer 1

You have the energy released by the black hole collision.  Divide it by the energy released in a 1 megaton nuclear blast, and that will be your answer.  What is the energy released in a 1 megaton nuclear blast?  Whatever it is, divide 5.373 x 10⁴⁷ J by that energy.