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View Poll Results: A puzzle

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  • The level will rise

    5 13.16%
  • the level will stay the same

    24 63.16%
  • The level will fall

    7 18.42%
  • Don't know

    2 5.26%
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Thread: Another puzzle for all you folks out there !

  1. #1
    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    Default Another puzzle for all you folks out there !

    Consider you are in a boat in a swimming pool and you have a rubber brick in the boat with you. If you throw the rubber brick overboard and into the water, it sinks to the bottom of the pool.

    What will happen to the level of the water in the pool?
    Assumptions:-
    No water loss at all from the pool (including evaporation)
    You can actually measure the level of water very accurately
    In fact, the only change is you throwing the brick into the water.


    the answer and reasoning will be come later

  2. #2
    Regular Member Robbie69's Avatar
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    Default

    The volume of the brick will be cancelled out by the slightly less displacement of the boat? This is probably a trick or there is some stupid answer?

  3. #3
    Forum Moderator soulman's Avatar
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    Default

    aint no einstein,but have gone for water level to fall slightly.mainly cos the weight of the boat is lessened so(although brick now in water).the water dispersement will be less ,causing water level to infact drop .thats Hales theory anyways lol

  4. #4
    Regular Member lofty's Avatar
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    Default

    fall.. something to do with water displacement and weights

  5. #5
    Full Member bobssignum's Avatar
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    Default

    As above the brick is allready adding to the water displacement of the boat, throwing it overboard just transfers the displacement directly to the water
    Driving vauxhall,s for 30 + years
    and still loving it

  6. #6
    Regular Member JagRigger's Avatar
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    Default

    In the boat, the brick must displace a volume of water equal to it's weight - as it is more dense than water, quite a bit.

    One it is in the water, it only needs to displace its true volume in the pool, so the level will drop.

  7. #7
    On a Sabbatical VauxVeteran's Avatar
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    Default

    To early for this.

  8. #8
    Regular Member morbid movie's Avatar
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    Default

    wouldn't the rubber brick float

  9. #9
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    Default

    The level will not change at all!!

  10. #10
    Regular Member mattolly86's Avatar
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    Default

    ok isnt this one volume vs dimensions and as rubber is heavy id say lifting out the boat will make the boat rise so the level will drop more than the increase of the displacement of the brick in the water, so the level will drop but my fat arse will stay roughly were it was lol

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