Sun massed black-hole?
* Q.1. Calculate the radius of a black hole that has the same Mass of Sun.
Ans: 
this is our Formula
$$ m =\text{ Mass of the sun} = 1.989x10^30 kg $$
this is our Formula$$ m =\text{ Mass of the sun} = 1.989x10^30 kg $$
$$ G =\text{ gravitational constant} = 6.672x10^-11 Nm^2/kg^2 $$
$$ c = 2.9979x10^8 m/s $$
so:
$$ R =2 * 6.672x10^-11 * 1.989x10^30/(2.9979x10^8)^2 $$
$$ R = ( 2.65412x10^20 ) / ( 8.98740441x10^16 ) $$
$$ R = 2953.156973 m or 2.953 km $$
$$ c = 2.9979x10^8 m/s $$
so:
$$ R =2 * 6.672x10^-11 * 1.989x10^30/(2.9979x10^8)^2 $$
$$ R = ( 2.65412x10^20 ) / ( 8.98740441x10^16 ) $$
$$ R = 2953.156973 m or 2.953 km $$
* I am currently reading this book "voyages through the universe ,third edition by Frankoi ,Morrison ,Wolff ",this book has some exercise which have no answers ,here I am solving the question on my own for knowledge .
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