Things you always wanted to know the answer to [Vol. 5]

Things you always wanted to know the answer to [Vol. 5]

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Discussion

gazzarose

1,158 posts

132 months

Saturday 6th March 2021
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GroundEffect said:
MartG said:
gazzarose said:
You know how nothing can go faster than the speed of light, even electricty. So if you wanted a Morse code type signal across a huge distance, like UK to Australia, a traditional electrical telegraph type setup takes a finite amount of time. If you had a reallllllllly long rod or a couple of hydraulic pistons and a long pipe, if you pushed one end, would the other end instantly move 5 miles away. I think for the sake of this problem we'll have to bend physics a bit to say that this hypothetical 10000 rod doesn't weigh a million ton so ignore any inertia, but keeping all other physics. Would a non compressible substance like either steel in the case of the rod or water in the case of the hydraulic system, compress slightly over that distance so that a wave of movement propagates along its length. On a small scale I can get my head around it, but visualising the far end of a 10k mile moving at the exact same moment as the end i poke makes my head hurt.
I believe a push on one end of a solid rod travels along the rod at the speed of sound in whatever material the rod is made of - very very fast but not instant


Correct. All materials are finitely stiff. Therefore take time for the reaction of a deflection to go from one end to the other. This happens at the speed of sound for the material.
That makes sense. As much as I couldn't visualise a steel rod compressing along its length, the far end moving in time with the near end seemed even less likely. Thank you

Hugo a Gogo

23,378 posts

232 months

Saturday 6th March 2021
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If you think about it, at an atomic level, the atoms don't 'touch' each other, even if each atom could move at the speed of light, and shove the next one Kinda another reason why faster than light engines couldn't work, without pushing the engine right through the space ship

98elise

26,376 posts

160 months

Saturday 6th March 2021
quotequote all
gazzarose said:
GroundEffect said:
MartG said:
gazzarose said:
You know how nothing can go faster than the speed of light, even electricty. So if you wanted a Morse code type signal across a huge distance, like UK to Australia, a traditional electrical telegraph type setup takes a finite amount of time. If you had a reallllllllly long rod or a couple of hydraulic pistons and a long pipe, if you pushed one end, would the other end instantly move 5 miles away. I think for the sake of this problem we'll have to bend physics a bit to say that this hypothetical 10000 rod doesn't weigh a million ton so ignore any inertia, but keeping all other physics. Would a non compressible substance like either steel in the case of the rod or water in the case of the hydraulic system, compress slightly over that distance so that a wave of movement propagates along its length. On a small scale I can get my head around it, but visualising the far end of a 10k mile moving at the exact same moment as the end i poke makes my head hurt.
I believe a push on one end of a solid rod travels along the rod at the speed of sound in whatever material the rod is made of - very very fast but not instant


Correct. All materials are finitely stiff. Therefore take time for the reaction of a deflection to go from one end to the other. This happens at the speed of sound for the material.
That makes sense. As much as I couldn't visualise a steel rod compressing along its length, the far end moving in time with the near end seemed even less likely. Thank you
Saying things "don't compress" is more of a relative term. They don't compress in any meaningful way in everyday use.

Hugo a Gogo

23,378 posts

232 months

Saturday 6th March 2021
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And a proper kebab place should finish an elephants leg in one night, so it's never reheated several times. The biggest I've seen was well over 2 foot across, and was a brand new one the next day

kowalski655

14,599 posts

142 months

Saturday 6th March 2021
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underwhelmist said:
All my university assignments are run through some software called turn it in, which checks for similarity with other papers. Don’t know if it’s available generally, or if it compares against sources like song lyrics etc. I’m going to try it with some song lyrics and will post results.
Don't know if it's the exact same program but my daughter's work got flagged for plagiarism for the word "the", and the contents of the bibliography!

popeyewhite

19,622 posts

119 months

Saturday 6th March 2021
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kowalski655 said:
Don't know if it's the exact same program but my daughter's work got flagged for plagiarism for the word "the", and the contents of the bibliography!
Why would you run a bibliography through Turnitin? hehe

coppernorks

1,919 posts

45 months

Saturday 6th March 2021
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Psycho Warren said:
back onto the original thread title....

oddball one, bear with me.

if you are mental and arrested and accused of an offence, under the current justice system, the court can order you into hospital for treatment or assessment. as a prisoner, you have few rights and you only really cwn get out when the court deems you fit. so it is possible to end up in the loony bin for a very long time. plus of course you will have the criminal case hanging over you until fit to go to court if not allowed to convict in your absence.

how is this effected if the charges are dropped? as a normal remand prisoner, as soon as the case drops, you are legally a free man and the courts cant touch you.

does this mean a court ordered psychiatric section for a prisoner becomes invalid at that point?

i ask as under civil rules, being sectioned is tightly controlled, you have significant rights and its time limited and regularly reviewed.

it would seemmo4ally wrong that someone who is no longer a criminal or suspected criminal could be held under criminal rules for mental illhealth.

cant find anything covering that transition.

i would like to think that a prisoner who is suddenly no longer a prisoner as above would have to be set free from hospital if they didnt also meet the criteria for a civilian section?

i ask as when i was ill i came close to this situation but was fortunately allowed bail.

Edited by Psycho Warren on Saturday 6th March 04:56
I would think if the court saw fit to send an accused person to a secure unit then that court thinks that that individual is probably unfit to plead or stand trial due to this mental health problem and the charge is effectively dropped, but yes, who decides when that person is fit to leave that unit, the court or the health professionals, and who is looking out for that person's rights ?

Lily the Pink

5,783 posts

169 months

Saturday 6th March 2021
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coppernorks said:
I would think if the court saw fit to send an accused person to a secure unit then that court thinks that that individual is probably unfit to plead or stand trial due to this mental health problem and the charge is effectively dropped, but yes, who decides when that person is fit to leave that unit, the court or the health professionals, and who is looking out for that person's rights ?
Does the Court of Protection have a role here ?

Psycho Warren

3,087 posts

112 months

Saturday 6th March 2021
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exactly my thoughts. if you were only remanded because of your behaviour or risk of breeching bail then if no charges are brought, its nfa'd or dropped due to lack of evidence then in essence legally you arent a prisoner.

its strictly a medical issue at that point. the courts rarely get involved with civil sections as all th3 power is with healthcare proressionals.

logic would say you would come off the court ordered section and go onto a section 2 or similar if you still meet the treatment threshold.

underwhelmist

1,852 posts

133 months

Saturday 6th March 2021
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popeyewhite said:
kowalski655 said:
Don't know if it's the exact same program but my daughter's work got flagged for plagiarism for the word "the", and the contents of the bibliography!
Why would you run a bibliography through Turnitin? hehe
I'm watching out for the parrot, but...because you write your paper as one document, and submit the whole thing including the bibliography/references.

Apparently they start to investigate deeper if the similarity score goes above 20%. It's impossible to get a similarity score of zero because there are so many commonly-used phrases. Nobody would expect a paper about engines to avoid the use of the phrase "internal combustion". And yes, I've seen it highlight common single words too.

popeyewhite

19,622 posts

119 months

Saturday 6th March 2021
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underwhelmist said:
I'm watching out for the parrot, but...because you write your paper as one document, and submit the whole thing including the bibliography/references.
Always keep an eye out for the Parrot

Turnitin checks for original content. No bibliography or list of references could be original. Therefore it is not supposed to be submitted. It doesn't matter whether your essay/thesis is one document or ten. Incidentally anything above a degree is expected to come in well below 20%. My MSc came in at 4%, with 500 references and comprehensive bibliography. If they'd been counted it would have been around 30% and a rejection! hehe

StevieBee

12,795 posts

254 months

Sunday 7th March 2021
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Stop Cocks.

Who, when designing houses, thinks "Mmm. This device to temporarily halt the flow of water into the house might on occasion come in handy, I shall find the most inaccessible part of the property in which to hide it, ideally in a place where it can seize up as well!"

Why?

Doofus

25,732 posts

172 months

Sunday 7th March 2021
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StevieBee said:
Stop Cocks.

Who, when designing houses, thinks "Mmm. This device to temporarily halt the flow of water into the house might on occasion come in handy, I shall find the most inaccessible part of the property in which to hide it, ideally in a place where it can seize up as well!"

Why?
Given builders always want to hide water pipes inside walls and underneath floors, where else could they put the stop cock?

Mine won't fully turn off, so when I'm replacing tap washers or something I have to work really fast. smile

V8mate

45,899 posts

188 months

Sunday 7th March 2021
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Doofus said:
Mine won't fully turn off, so when I'm replacing tap washers or something I have to work really fast. smile
Same here. And when the meter was last replaced, I couldn't turn the tap on that fully off either.

Luckily, a bloke from the water company came round last autumn to do some maintenance along the street. I mentioned the issue and he advised that even though it has a plastic cap, I should show it no mechanical sympathy and just keep turning it, no matter how cringe-inducing the sound of the tap cap self-destructing hehe

Rostfritt

3,098 posts

150 months

Sunday 7th March 2021
quotequote all
V8mate said:
Same here. And when the meter was last replaced, I couldn't turn the tap on that fully off either.

Luckily, a bloke from the water company came round last autumn to do some maintenance along the street. I mentioned the issue and he advised that even though it has a plastic cap, I should show it no mechanical sympathy and just keep turning it, no matter how cringe-inducing the sound of the tap cap self-destructing hehe
Good to know. I've had two plumbers round and neither have found the stop tap in the house so have turned it off on the street. I have a pipe going up the corner of the kitchen with a tap halfway up it that I cannot turn at all. But that only makes a sound when the hot tap is on and not the cold, so it has completely baffled anyone having a look at it. Presumably it feeds the boiler, but nobody can find where the cold water goes.

glazbagun

14,259 posts

196 months

Monday 8th March 2021
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Another etymology one- how did Vault (meaning to jump) and Vault (a place to store valuables) end up with the same word?

akirk

5,377 posts

113 months

Monday 8th March 2021
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glazbagun said:
Another etymology one- how did Vault (meaning to jump) and Vault (a place to store valuables) end up with the same word?
Guessing here...

to vault is to span as in an arch - so storing valuables under the arches / to span a ditch = to jump it or something like that?! smile

Doofus

25,732 posts

172 months

Monday 8th March 2021
quotequote all
akirk said:
glazbagun said:
Another etymology one- how did Vault (meaning to jump) and Vault (a place to store valuables) end up with the same word?
Guessing here...

to vault is to span as in an arch - so storing valuables under the arches / to span a ditch = to jump it or something like that?! smile
Makes sense.

Although of course, vault (to jump) is a verb and vault (cellar) a noun.

popeyewhite

19,622 posts

119 months

Monday 8th March 2021
quotequote all
Doofus said:
akirk said:
glazbagun said:
Another etymology one- how did Vault (meaning to jump) and Vault (a place to store valuables) end up with the same word?
Guessing here...

to vault is to span as in an arch - so storing valuables under the arches / to span a ditch = to jump it or something like that?! smile
Makes sense.

Although of course, vault (to jump) is a verb and vault (cellar) a noun.
I suspect there is more than one original meaning of 'vault'.

Tyre Smoke

23,018 posts

260 months

Monday 8th March 2021
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Many words in the English language are spelt the same but mean very different things depending on context. Cleave being one of my favourites. You can cleave something together or cleave it apart.