HELP WITH IMPONDERABLES

[Ian Z]

Anyhoo,
Are Lobsters Ambidextrous?

If something "goes without saying", why do people still say it?

If a cow laughs hard, does milk come out it's nose?

Why is it in Walmarts, there is a sign that says this exit is not an
entrance? Isn't that implied it is not an entrance when it is called an exit?

If a police officer is on a way to the crime, and he sees another one on the way to the original one, does he stop? or does he go where he is called?

Why is it police officers do not wear their seat belts when we get fined if we don't? Are they not able to be thrown from the car?

Why do we call it a near-miss? If we avoided an accident, shouldn't it be called a "near-hit".

Where does your lap go when you stand up?

If it is true that we are here to help others, then what are the others here for?

Does killing time damage eternity?

Why is it that when you are driving and looking for an address, you turn down the volume on the radio?

If space is a vacuum who changes the bags?

If swimming is good for your shape then why do the whales look the way they do?

How does the non stick coating stay on a pan?

If knees were backwards what would chairs look like?

Why isn't phonetics spelled like it sounds?

Why is it awkward silence is always broken up by laughter or some one saying - hmmm awkward silence?


What would you say if the Pope sneezed.

What happens if you get scared half to death twice?

How do you tell when you run out of invisible ink?

Dave, OK so what is the speed of dark?

Despite the cost of living, it remains popular.

Why did you forget what you were looking for as soon as you leave the room?

Why can't you tickle yourself?

What was Captain Hook called before he lost his hand?

Why is Dyslexia so hard to spell?

Why doesn't Tarzan have a beard?

How come wrong numbers are never busy?

If your therapist asked you to "let your mind go blank", how would you know?

Have you ever imagined a world with no hypothetical situations?

If a mute swears, does his mother make him wash his hands with soap?

What if you discovered an endangered animal that only eats endangered plants?

If someone with multiple personalities threatens to kill themself is it considered a hostage situation?

Andy, how do you know when it is time to tune your bagpipes?

[Ian Z]

I like these...

If you try to fail and succeed, which have you done?

Is it because light travels faster than sound that some people appear bright until you hear them speak?

What colour hair do bald men put down on their driver's licence?

Why do people say "It's always in the last place you look"? Of course it is always in the last place you look, what kind of moron would keep on looking after he'd found it?

Why don't you ever see baby pigeons?

[Anonymous]

Dave
If Einstein's principle of equivalence says that you can't tell the difference between being in a stationary elevator in a gravitational field and an accelerating elevator in free space. However, if the stationary elevator is in a field that has the magnitude of that of a black hole, your temperature will increase due to Hawking radiation. If you are accelerating in free space (at a value equal to g of the black hole) your temperature will increase according to the Davies-Unruh effect. However, the Hawking formula predicts a different temperature to the Davies-Unruh formula. So, we can imagine a thought experiment where we can measure this difference, and hence tell if the elevator is accelerating or not. Does this violate Einstein's principle of equivalence? Explain.

[Dave999]

thing is, we always assume Dave is correct on these matters. He rarely gets challenged, then always has the definitive answer.

never believe a word...

I said Prague was in Poland last week considering i'd been googling how to spell cracow krackoff Krakow erm exactly i expected there to be a few more Cs and Zs half our IT development stuff is outsourced to Prague and Warsaw so it must be on me mind hehehhe

Dave

[Dave999]

Dave
If Einstein's principle of equivalence says that you can't tell the difference between being in a stationary elevator in a gravitational field and an accelerating elevator in free space. However, if the stationary elevator is in a field that has the magnitude of that of a black hole, your temperature will increase due to Hawking radiation. If you are accelerating in free space (at a value equal to g of the black hole) your temperature will increase according to the Davies-Unruh effect. However, the Hawking formula predicts a different temperature to the Davies-Unruh formula. So, we can imagine a thought experiment where we can measure this difference, and hence tell if the elevator is accelerating or not. Does this violate Einstein's principle of equivalence? Explain.

Id rather you went first and i'll point out the pertinent lines after












the first bit is alright

stationary in a gravitational field no probs am doing that now

remove it and i'll float

replace that force with something of exactly the same magnitude acting directly up against my bum i.e the force of acceleration applies the lift floor to my ass in a forceful manner and i won't be able to spot the difference especially if all i can see is

in emrgency press emergency button to be connected to Chubb security


in a field the magnitude of a black hole....infinite gravity

will make me accelerate towards the centre infinitly fast.

hawking can then Bananarama! off cos i'm stretched infinitly long and my elevator is cactus

i know nout about Davies-Unruh

but if they and hawking come up with different figures for the radiation given out or absorbed by going That fast
then in theory you can compare the value you would get for g of the black hole

if the elevator continues to accelerate then yes Eisenstein is wrong
he reckons you can only accelerate up to a velocity that is a tiny bit slower than the speed of light. i.e you stop accelerating

if that is actually true the black holes wouldn't be black. you can see light traveling at the speed of light so you should see things traveling at that speed into the hole and you don't

to be black they have to have a gravitational field that is big enough to suck in light and every other type of radiation.... if they do that the acceleration caused by the black hole has to be big enough to accelerate light to faster than the speed of light.

the issue is whether you can apply what works for light to anything else that has a physical presence cos they can't work out if light is a particle or a ray.

I think

Breakfast time

Dave

[Anonymous]

If the wind is traveling at 70mphs north, and your doing 70mph north in your car, if you stick your head out the window, is it a normal day?

Yes

[Anonymous]

Dave
If Einstein's principle of equivalence says that you can't tell the difference between being in a stationary elevator in a gravitational field and an accelerating elevator in free space. However, if the stationary elevator is in a field that has the magnitude of that of a black hole, your temperature will increase due to Hawking radiation. If you are accelerating in free space (at a value equal to g of the black hole) your temperature will increase according to the Davies-Unruh effect. However, the Hawking formula predicts a different temperature to the Davies-Unruh formula. So, we can imagine a thought experiment where we can measure this difference, and hence tell if the elevator is accelerating or not. Does this violate Einstein's principle of equivalence? Explain.

Einstein's equivalence principle is somewhat imprecise since there is no universal method of distinguishing gravitational and non-gravitational experiments.

However the strong equivalence principle takes the laws of gravity to be independent of velocity and location. Since the strong equivalence principle suggests that gravity is purely geometrical, Einstein's theory of general relativity satisfies it more closely than the equivalence principle.

However, both neglect tidal forces and are thus only really applicable to small bodies.

So, yes it does violate the principle of equivalence.

Doesn't everyone know that!

[Anonymous]

My o my we are all busy with the cut and paste today.

[Ivor]

Ooh, Captain Cynical arrives on the scene! Ta Daaaa!

[latil]

Does this have any bearing on my choice of cam?

[Anonymous]

thing is, we always assume Dave is correct on these matters. He rarely gets challenged, then always has the definitive answer.

never believe a word...

I said Prague was in Poland last week considering i'd been googling how to spell cracow krackoff Krakow erm exactly i expected there to be a few more Cs and Zs half our IT development stuff is outsourced to Prague and Warsaw so it must be on me mind hehehhe

Dave

Dave, I've always believed everything you type to be correct.

[Anonymous]

HI dave not bad but if you examine a nearly extreme macroscopic Reissner-Nördstrom black hole in the context of semiclassical gravity. The absorption rate associated with the quantum tunneling process of scalar particles whereby this black hole can acquire enough angular momentum to violate the weak cosmic-censorship conjecture is shown to be nonzero.
In other word if you are in a lift anf the temperature rises-
Get out qiuck as you may be in a hairy black hole.
Basically when you come out the other side you will be standing on the ceiling!

[Anonymous]

My o my we are all busy with the cut and paste today.

Not a cut and paste in sight, plenty of paraphrasing though. Well I didn't write the bloody theory did I!

[Ian Z]

Dave999 is never wrong even when he's not right.

[Anonymous]

Hooray for Google.

I think I will have a go at looking up a theory too Bob you naughty plagiarising old devil you.