Question

What is the condition for a body projected from the surface of the earth to behave as a black hole?

Answer 1

@Mashy

Answer 2

:O .. WHAT?!??.. what has.. black hole gotta do with PROJECTION? black hole purely depends on the density!.. you need some enormous density for it to be considered as a blackhole

Answer 3

yeah i want the answer in terms of radius/density only :o

Answer 4

there is something called as schwarzchild radius.. google it :P

Answer 5

oho..mast..if we project it greater than equal to speed of light so it might behave as black hole..how do we do it numerically?

Answer 6

i think you need to use relavistic speeds and stuff.. don't tell me this is a part of your syllabus? :O

Answer 7

\[\LARGE V_e > c\]

Answer 8

hmm it is :P

Answer 9

\[\LARGE \sqrt{\frac{2GM}{R}}\ge c\]

Answer 10

OMg now i understand what you are trying to say.. your question was so poorly constructed man :-/

The escape velocity > C.. blah!!

Answer 11

that is the condition for it to behave as a black hole?just asking..thats not the Q

Answer 12

Yes yes.. that is the expression for escape velocity from the surface of a planet or star or any mass for that matter :P

which has a mass M and radius R..

Answer 13

if the escape velocity is greater than light, then it means its a black hole

Answer 14

how can a body become black hole because of its speed :S
and can u find the value of radius of the body ?

Answer 15

a body can become a black hole because of its speed
Cause as you move your mass increases :P.. but thats relativity.. !
Please post exactly what is the question?? the question you stated seems absurd!

Answer 16

Q is correct :/ and mass will increase to? black hole o.O why will it absorb

Answer 17

when you say condition? what exactly is it that you are asking for? :O

and mass increase is given by this relation

\[m(moving) = m(rest) /\sqrt{1- v ^{2}/c^{2}}\]

Answer 18

wtf

Answer 19

I told you.. thats the expression you get from Einstien's theory of relativity!