Things you always wanted to know the answer to [Vol. 3]
Discussion
Driving licence thing.
Each licence holder in England, Scotland and Wales has a unique driver number, which is 16 characters long. The characters are constructed in the following way: 1–5: The first five characters of the surname (padded with 9s if less than 5 characters)
https://www.licencebureau.co.uk/driver-licence-num...
my Driving licence starts GOW99
Each licence holder in England, Scotland and Wales has a unique driver number, which is 16 characters long. The characters are constructed in the following way: 1–5: The first five characters of the surname (padded with 9s if less than 5 characters)
https://www.licencebureau.co.uk/driver-licence-num...
my Driving licence starts GOW99
glenrobbo said:
mickk said:
kowalski655 said:
Wiccan of Darkness said:
RATATTAK said:
glenrobbo said:
Cold said:
JagerT said:
grumbledoak said:
What would it take to stop PHers using 'Quote All'?
Not sure,what do other people think ?
James Bond type MI6 MI5 type spies.
In the olden days they used secret miniature cameras to copy secret documents and send a physical microdot image back to HQ
Nowadays do they just use their iPhones and whatsapp the secret documents back to base, or do they use a secret special spy app?
In the olden days they used secret miniature cameras to copy secret documents and send a physical microdot image back to HQ
Nowadays do they just use their iPhones and whatsapp the secret documents back to base, or do they use a secret special spy app?
RammyMP said:
glenrobbo said:
mickk said:
kowalski655 said:
Wiccan of Darkness said:
RATATTAK said:
glenrobbo said:
Cold said:
JagerT said:
grumbledoak said:
What would it take to stop PHers using 'Quote All'?
Not sure,what do other people think ?Ayahuasca said:
....Nowadays do they just use their iPhones and whatsapp the secret documents back to base, or do they use a secret special spy app?
One assumes that in this day and age there is no need to actually send a man in to look at Secret Documents, they are copied via the use of computer hackers and any 'secret special spy app' will be sneaked onto the phone or laptop of unsuspecting workers in interesting places (eg. whoever cleans Putin's office) to capture whatever the camera and microphone can pickup as they wander about the building.MartG said:
227bhp said:
MartG said:
Your original post specified 'atmospheric pressure' as one option, not 'pumped or not'
Gravity feed would work in a vacuum ( assuming the liquid didn't boil off )
No it wouldn't. Lets take the water tower as an example, if the top of it was sealed 100% airtight the water wouldn't flow out. Gravity feed would work in a vacuum ( assuming the liquid didn't boil off )
That will be never then.
MartG said:
Anyway, you are altering the conditions by specifying a sealed water tower - they aren't sealed. Air pressure acts on both the water in the water tower and on your tap - but the difference in air pressure is negligible compared to the pressure water is supplied at. Standards require a minimum supply pressure to domestic premises equivalent to 7m static head, or about 1.7 atmospheres.
All I have done is to tell you IF the top of the water tower was sealed shut then the water would not flow out. It's quite obvious I've done this to show you how atmospheric pressure works.You can do a simple test in your house; take a piece of pipe or a drinking straw, fill it with water, place your finger over one end and hold it up, anyway up, the water won't fall out until you either shake it (centrifugal force) or remove your finger.
The water won't flow from either of my examples because AP can't get to it to force it out.
RizzoTheRat said:
227bhp said:
No it wouldn't. Lets take the water tower as an example, if the top of it was sealed 100% airtight the water wouldn't flow out.
It would if the tower's more than 10.3 meters high. Below that atmospheric pressure at the other end will keep the water in, but that's against a vacuum. If the top is vented the atmospheric pressure difference will be less than you'd get by waving your hands over it. 
227bhp said:
MartG said:
227bhp said:
MartG said:
Your original post specified 'atmospheric pressure' as one option, not 'pumped or not'
Gravity feed would work in a vacuum ( assuming the liquid didn't boil off )
No it wouldn't. Lets take the water tower as an example, if the top of it was sealed 100% airtight the water wouldn't flow out. Gravity feed would work in a vacuum ( assuming the liquid didn't boil off )
That will be never then.
MartG said:
Anyway, you are altering the conditions by specifying a sealed water tower - they aren't sealed. Air pressure acts on both the water in the water tower and on your tap - but the difference in air pressure is negligible compared to the pressure water is supplied at. Standards require a minimum supply pressure to domestic premises equivalent to 7m static head, or about 1.7 atmospheres.
All I have done is to tell you IF the top of the water tower was sealed shut then the water would not flow out. It's quite obvious I've done this to show you how atmospheric pressure works.You can do a simple test in your house; take a piece of pipe or a drinking straw, fill it with water, place your finger over one end and hold it up, anyway up, the water won't fall out until you either shake it (centrifugal force) or remove your finger.
The water won't flow from either of my examples because AP can't get to it to force it out.
Can you explain how you can use atmospheric pressure to create a head of water pressure without any pumping action?
There are two ways to make water flow through a pipe, gravitational kinetic energy transformed to kinetic energy, or a pressure differential between then ends of the pipe
Edited by 98elise on Sunday 26th November 14:50
227bhp said:
If I go to the top of the tallest building I can find in the UK and drop a 100kg anvil off it along with a small glass marble at the same time which would hit the ground first?
good question, how much force does the air resistance push up on the 100kg anvil? this would probably depend on the shape and whether it rotates in fall.the small marble would in theory not have much air resistance so should hit first.
227bhp said:
...stuff...
Again, that is not what you originally askedAnd for f
ks sake, for the final time, atmospheric pressure has fk all to do with delivery of water to your house ! I'm a qualified engineer so I know what I'm talking about ! The only instance where air pressure is used to deliver water is onboard a ship, where having a large mass of water at the top of the ship would cause stability issues, so air pressure is used instead.alorotom said:
sleepera6 said:
How are 11 year olds convincing their parents to purchase them iPhone 8’s , swanky designer clothes and £200 Nike shoes?
As seen on daughter’s friend who came over for her birthday
The same way kids used to convince parents to buy tv, vcr, bmx, etc... for themAs seen on daughter’s friend who came over for her birthday
227bhp said:
All I have done is to tell you IF the top of the water tower was sealed shut then the water would not flow out. It's quite obvious I've done this to show you how atmospheric pressure works.
Try it again with a straw 33 feet long.Or 80cm long and use mercury.
Some liquid will run out and you'll get a vacuum at the top. Hey - you've made a barometer!
Einion Yrth said:
The Mad Monk said:
I would like to know the answer to.......
When filming some news event, why do people hold their cameras in portrait mode?
Why not landscape mode?
My telly is in landscape mode. Copy that.
Because, idiots.When filming some news event, why do people hold their cameras in portrait mode?
Why not landscape mode?
My telly is in landscape mode. Copy that.
But, how are we doing to stop them doing it?
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