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    Was I dreaming?

    Was I dreaming or was there a post on here asking people 'Which tank would fill first'? I'm sure there was, but I'm damned if I can find it. I commented too. Most weird!!

    18 Comments

    Nah, you weren't dreaming it, can't find it either though.

    Saw one on facebook the other day, but cannot find now.
    Edited by: "Tr1gger" 6th Jan

    Mod & Ed

    Is this it HERE?

    https://us-static.z-dn.net/files/d58/f6b55980140dd882e86eb7c7e8613cd5.jpg

    Lots of variations of the diagram, some have the pipes between tank(s) blocked as a trick.

    I reckon number 3

    M1 Abraham for sure.

    depends if the water freezes and where

    peeej1978

    M1 Abraham for sure.


    I agree

    We did something like this is school some 25+ years ago and something tells me its 4

    3 and 4 fill equally first.... I googled for a demo. (_;)

    3 will fill slightly before 4, due to friction in the interconnecting pipe requiring a pressure head to fill tank 4.

    It's 3 on this post. It's 2 on the other post.

    Original Poster

    The answer is 'No, I wasn't dreaming'. Thanks. glad I'm not totally insane.

    Bobbajob

    3 will fill slightly before 4, due to friction in the interconnecting … 3 will fill slightly before 4, due to friction in the interconnecting pipe requiring a pressure head to fill tank 4.



    Drink to that.

    Original Poster

    landros1

    Drink to that.



    ​ to fill totally to the brim then number 4 must be the answer, as 3+4 are the same but 4 fills from the top and drains 3 from the bottom forming a siphon. Once started the siphon will pull all the water out of tank 3 until air enters the drain pipe cancelling the vacuum. So 4 will fill to overflowing -the others can't.

    Bobbajob

    3 will fill slightly before 4, due to friction in the interconnecting … 3 will fill slightly before 4, due to friction in the interconnecting pipe requiring a pressure head to fill tank 4.



    You aren't factoring in the backpressure from 1 and 2

    It was on the test your IQ in the misc section
    here
    Edited by: "LillyM" 6th Jan
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