What would you have to do to make earth a black hole ?

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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What would you have to do to make earth a black hole ?
Expert Solution
Step 1

Black holes are objects in space from which even light can not escape. What makes the black hole so distinctive is its immense density. It is so dense the light will also be trapped in its gravitational field

 

In order to make the earth a black hole we need to shrink it to produce a gravitational field whose escape velocity is greater than the speed of light.

 

The mass of earth 5.972 x 1024 kg

The relation between the radius of the black hole and the mass of the black hole is

Physics homework question answer, step 1, image 1

Where

G is the Universal gravitational constant ( 6.67 x 10-11 m3kg-1s-2)

M is the mass of the black hole (5.97 x 1024 kg)

c is the velocity of light ( 3.00 x 108 m/s)

Step 2

substituting with the above values

Physics homework question answer, step 2, image 1

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