What would happen if you tried to swat a black hole the size

You will be dead.

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>black hole
>the size of

>>7724028
>black hole with a schwarztfield radius of 1/4 inch

It would weigh more than the earth you would end up snapping your neck accelerating towards it.

>>7724033
earth mass black hole radius is 8.87 millimeters, like a big bly

>>7724099
And 1/4 inch is like 6.5 mm, so it's pretty close.

>>7724032
>>7724099
>>7724134
How fast would such a black hole evaporate?

>>7724203

it wouldn't, it would still be colder than the cosmic background radiation, so you would have to wait a few trillion years for the universe to get colder.. and then a few fucktillion years more.

http://xaonon.dyndns.org/hawking/

>>7724022
you would get abosrbd XD and then all the earth XD

>>7724234

>wait a few trillion years

....the mass of the singularity is proportional to the time it takes for it to completely dissolve.

So for something the size of a fly, it wouldn't take trillions of years.

Maybe thousands....but certainly not trillions....

>>7724203
well the mass of such a black hole can be found using this equation [eqn] r_s= \frac{2GM}{c^2} [/eqn] A house fly is about 8 mm long, so it's radius is .004 m. .004=2*6.67*10^-11*M/(3*10^8)^2
M=2.7*10^24 kg.
The time for evaporation of a black hole is proportional to the cube of its mass: [eqn] t_{ev}= \frac{5120 \pi G^2 M_0^3 }{ \hbar c^4 } =8.41*10^{-17} M_0^3 [/eqn] So it would take 1.65*10^57 seconds to evaporate (without any matter around, it would take longer because the earth's atmosphere would feed it). This number equates to 52 trillion trillion trillion trillion years. So >>7724256 is completely wrong.

>>7724295
>proportional to the cube of its mass

I stand corrected. Thank you anon.

>>7724295
>it would take longer because the earth's atmosphere

The mass of this black hole is comparable to mass of earth. I don't think earth would still have atmosphere.

>>7724350
Let's instead consider a black hole the mass of a fly. According to my calculations it would take this black hole 6.7*10^-31 seconds to evaporate. How would the earth's atmosphere play a part here? Are the air molecules spread out enough for this black hole to evaporate without even touching anything?

>>7724295
Thanks.

>>7724295
With that kind of mass, everyone in the region would be ripped apart by tidal forces before the black hole falls to the center of the Earth and consumes the planet within hours or days.

>>7724366
>6.7*10^-31 seconds to evaporate

that's really fucking short - like, more than a dozen orders of magnitude smaller than the shortest time period ever measured.

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>>7724366

it doesn't really matter, if it evaporated in earth's atmosphere it would cause a massive explosion. Not as big as a nuclear weapon (it would have the mass-energy equivalent of a fly, after all) , but definitely big - if my calculations are correct, about 500 kT

So more or less pic-related-big.

>>7726349
the gram of antimatter reacting with its ordinary matter counterpart gives 43 kilotons of explosive force. The fly weights less than gram, how could black hole with mass of fly generate 500 kilotons?

>>7724022
Tidal forces murder you.

>>7724295
>>7724366
>https://en.wikipedia.org/wiki/Hawking_radiation#Black_hole_evaporation
Alright, you looked up equations, but you clearly don't understand how these numbers fit into a physical context.

Black hole evaporation is based on the difference between the black hole's release of energy and its intake of energy. Energy intake includes the mass that falls into the black hole. This means that any sufficiently massive black hole, one that could start taking in atoms from its environment, can have its energy returned to it and more. Even a very small black hole can potentially enter a growth cycle instead of dissipating. There's no rule stating that the black hole's mass can't grow, after all. This is definitely what would happen with a black hole with a fly-sized Schwarzschild radius. This black hole would fall into the planet an swallow it from within in ever-growing swathes.

As for the small-mass black hole, its Schwarzschild radius is much smaller than any proton. It's unlikely to take in much energy in its short lifetime, so the result would likely be a very violent output of Hawking radiation as the black hole dissipation almost instantly lets out the full energy of all the atoms that make up a fly.

>>7724099
still though, we don’t feel the gravity the earth would have close to the center if it was really small. we feel it on the surface. a black hole the mass of the earth would exert the same force as the earth from a distance equal to the earth’s radius. you’d still snap your neck and crash some bones

Nothing because blackholes dont exist

>>7726455

sorry, I meant 500 tons, not kilotons.

>>7724022
It would be extremly painful

>>7728720
You're a big fly.