# If you go fast enough will you turn into a black hole

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I was just thinking, once an object has a certain critical mass( or is it density?) it will turn into a black whole. The faster you go the larger your relative mass will get. If you go fast enough could you turn into a black whole.

( also, is your mass increase only relative to an slower moving observer. If it is, could their be such a thing as a relative black hole... [suddely goes cross eyed and has a pounding headache} mabey am thinking to hard, or not enough. if some one could clearn this up for me i would greatly appreate it.

You will not turn into a black hole, since the mass in your coordinate system is unchanged. The gravitational effect on other bodies, which are going past you at close the speed of light, will be effected.

An example of a similar effect occurs in particle accelerators, where the particles are traveling very close to the speed of light. The strength of the magnetic field of the accelerator has to be adjusted for this increased mass, to keep the charged particles on track.

Greetings !

I'd like to add that a BH has no normal (Hawking
Radiation I consider abnormal here) emmisions -
its escape velocity is greater than c. However,
it is abvious that nothing (with rest mass)can
reach c relative to you and hence you will
always be able to receive EM signals from it,
which means that relative to you it won't be a BH.

Live long and prosper.

Might there be a supersymmetric velocity near c where massive bodies reduce to pure energy?

What's pure energy ?
No electromagnetic interactions with other objects ? Only gravitational ? Or what ?

Pure energy=energy without rest mass

Got it...

If you had a rectangular prism/bar and caused it to spin at c, could it collapse into a black hole (at the axis)?

It's impossible to rotate something at c, plus the axis would be at rest. Also, as has been pointed out, relatavistic mass does not contribute to whether or not something collapses into a black hole.