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What I don't understand

is

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Male
Jeff  Male  East Sussex
24-Oct-2017 10:41 Message #4703736
Many people, such as politicians, appear live on satellite television channels.

I don't understand how they get all those people to and from the satellites.


What don't you understand?
Male
Argonaut  Male  Lancashire
24-Oct-2017 11:12 Message #4703741
I saw an advert for a Damaged Screw Remover - what I don't understand is why someone would want to buy an item that's been damaged - unless, of course it's a T-shirt or a pair of jeans!




Jason.
Male
badman  Male  Suffolk
24-Oct-2017 13:40 Message #4703745
What I don't understand is the train announcer saying that the train will arrive at 1930.

How do they get it to go back in time?
Female
JEM95  Female  Oxfordshire
24-Oct-2017 19:32 Message #4703751
What I don’t understand is if you are blind from birth what do you dream about if you have never seen anything?
Female
Minnie-the-Minx  Female  Hertfordshire
24-Oct-2017 20:15 Message #4703752
Why do you get on to trains and buses, but into a car?
Male
brisinger-the-beekeeper  Male  Lancashire
24-Oct-2017 21:12 Message #4703756
*What don't you understand? *

Homo Sapiens
Male
Jeff  Male  East Sussex
24-Oct-2017 22:34 Message #4703761
Do you mean that you don't understand people, or you don't understand why they are called wise (sapiens)?
Male
tumbled  Male  Gloucestershire
25-Oct-2017 03:31 Message #4703773
I do not understand what 'Je ne comprends pas' means in English
Male
Argonaut  Male  Lancashire
25-Oct-2017 07:38 Message #4703774
Another thing I don't understand is why people say they're going to have 'forty winks' when they mean a nap - don't they sleep with their eyes closed?





Jason.
Male
The_38th_Parallel  Male  Essex
25-Oct-2017 09:32 Message #4703782
I don't understand when you call the GP's and the doctor is all booked up and the only appointment is with the practice nurse.
I'd prefer to see one who's qualified.
!!
Male
zodiac1  Male  Flintshire
25-Oct-2017 10:36 Message #4703784
who in their right mind would consult a dentist who still practices ?
Male
Eljer  Male  North London
25-Oct-2017 10:53 Message #4703787
What i dont understand is on certain forms, im not allowed to say im english but allowed to say i speak english.

Well, i sort of understand.
Female
Madness102  Female  South Yorkshire
25-Oct-2017 21:08 Message #4703838
Tumbleweed - I thought that was very funny - and I did understand it !!

What I dont understand is :
Who are "they"
Everybody refers to them but no-one has ever seen them.
Male
HonestBob  Male  the Central region
28-Oct-2017 18:42 Message #4704070
"What don't you understand?"

Is this a jokey/giggley type of thread or can a serious topic of "Not understanding" be put forward?

Male
AndyMacG  Male  the West Midlands
29-Oct-2017 09:59 Message #4704091
What i don't understand is why my light bulbs only blow at night ;--) lol





Andy Mac
Male
Jeff  Male  East Sussex
29-Oct-2017 16:14 Message #4704123
I hoped that my opening post would indicate that it is intended to be a jokey/giggley type of thread.

The number of things that I really don't understand far exceeds what I do understand.
Male
HonestBob  Male  the Central region
29-Oct-2017 16:20 Message #4704125
"The number of things that I really don't understand far exceeds what I do understand."

You're in the same boat as me...

I don't understand how they get boats/ships that weigh thousands of tonnes to float!
Male
Jeff  Male  East Sussex
29-Oct-2017 16:50 Message #4704126
In 1973 I wrote a paper about The Microscopic Interpretation of Archimedes Principle, as I was dissatisfied with the usual explanations. In 2013 I uploaded it onto one of my websites, and a few months ago my maths tutor corrected some of my errors, and I'm unsure if it involves a circular argument.

Basically, the Boltzmann distribution, which gives the number of molecules at different heights, (applicable for gases but I guess similar for liquids and even solids), has fewer molecules at greater heights. At a given temperature, the pressure is proportional to the number of molecules, so there is more pressure under the boat (maybe the same boat as you!), and that makes it float.
Male
HonestBob  Male  the Central region
29-Oct-2017 19:06 Message #4704146
"Basically, the Boltzmann distribution, which gives the number of molecules at different heights, (applicable for gases but I guess similar for liquids and even solids), has fewer molecules at greater heights. At a given temperature, the pressure is proportional to the number of molecules, so there is more pressure under the boat (maybe the same boat as you!), and that makes it float."

Yes... that's what I thought :o :o :o :D :D: D
Male
johnlock  Male  Essex
2-Nov-2017 20:51 Message #4704553
No, it the weight of the water displaced... nope never mind, I can't be arsed! LOL Go ask a certain Greek chappy by the name of Archimedes but I heard that he popped his clogs a while back.

Regards
John
Male
Jeff  Male  East Sussex
2-Nov-2017 21:17 Message #4704556
Archimedes had two ideas about objects in water which are sometimes confused.

1. The volume of a liquid displaced is equal to the volume of the object put into it - so, for example, you can find the volume of a king's crown by immersing it in a full container of water and seeing how much it overflows. That is easy to explain.

2. The upthrust force by a fluid is equal to the weight of the object put into it - so for example a balloon of Helium rises or a whale seems to weigh less in water than on land. I was unsatisfied by the usual explanations of that.
Male
Jeff  Male  East Sussex
2-Nov-2017 21:33 Message #4704557
By an "explanation", I mean the cause of what happens rather than just stating clearly what happens.
Male
Jeff  Male  East Sussex
2-Nov-2017 21:55 Message #4704559
Correction: The upthrust force by a fluid is equal to the weight of the fluid in the volume that the object occupies.
Female
eurostar  Female  Merseyside
2-Nov-2017 22:02 Message #4704561
I just don't understand,...
Male
Jeff  Male  East Sussex
2-Nov-2017 23:26 Message #4704576
Suppose an object has volume 24 cubic metres, for example it measures 2 metres x 3 metres x 4 metres.

And suppose it is completely immersed in a liquid, say sea water having density say 1,027 kgm per cubic metre.

Then the weight of the same volume of the sea water that the object occupies is 24 cubic metres x 1,027 kgm per cubic metre, which is 24,648 kgm force. Archimedes' Principle says that that is the force upwards (upthrust) on the immersed object.

While the object is fully immersed:-
- If the object itself weighs more than the upthrust, then the object will sink. (Or by Newton's 2nd law it will accelerate downwards).
- If the object itself weighs less than the upthrust, then the object will float. (Or by Newton's 2nd law it will accelerate upwards).

But what causes Archimedes Principle?

Water molecules bouncing against an object exert a pressure. My explanation for the upthrust is that there are more water molecules below the object than above it.
But the maths of the number of molecules at different heights (or depths) has to agree with that explanation. Which it does.

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