Question

What is the formula to create a black hole?

Answer 1

Answer on Question#55599 - Physics / Astronomy | Astrophysics

What is the formula to create a black hole?

Solution

Escape velocity for a star is $v = \sqrt{\frac{2GM}{r}}$, $M$ – mass of the star, $r$ – its radius, $G$ – gravitational constant. If $v > c$ ($c$ is the speed of light in vacuum) nothing could escape from the gravity. $c^2 = \frac{2GM}{r}$, $r = \frac{2GM}{c^2}$ – gravitational radius.

Answer: $r = \frac{2GM}{c^2}$

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