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Thread: Need your comments on the principle of floatation

  1. #1 Need your comments on the principle of floatation 
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    A pineaple was bisected and the two halves were thrown inside the ocean. The first landed with the back(cureved surface) and sank while the second halve landed with the flat surface and foat. So, what is reason behind these actions?


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    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by seadoftj View Post
    the second halve landed with the flat surface and foat.
    I can't imagine how that could possibly happen. Are you saying you actually did this?


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    Universal Mind John Galt's Avatar
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    I am presuming you actually carried out this 'experiment'. However, it is likely to have been very poorly controlled. Specifically:

    1. Did you only carry out a single test.
    2. Did you confirm that the pineapple was cut precisely in half
    3. Did you confirm that the density each half was identical
    4. Did you examine the porous structure of each half to identify differences, especially of permeability
    5. Did the half that sank sink out of sight or did it just 'hover' a few inches below the surface
    6. How long did you leave the two halves to see if there was a long term change

    That said the simplest explanation is that when the pineapple lands on its back the water cannot easily enter any air cavities in the interiror, whcih is the case when it is thrown 'face down'.
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  5. #4  
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    It was carried out once. It was a bad pineapple. It was approximately cut into two but level of porousity cannot be ascertain. I need to back to the experiment and try again. It was beyond my imaginatgion.
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    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by seadoftj View Post
    It was carried out once. It was a bad pineapple.
    I'm guessing it was fermenting and there was (more) gas trapped in the half that floated.
    ei incumbit probatio qui dicit, non qui negat
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  7. #6  
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    Quote Originally Posted by Strange View Post
    Quote Originally Posted by seadoftj View Post
    It was carried out once. It was a bad pineapple.
    I'm guessing it was fermenting and there was (more) gas trapped in the half that floated.
    That sounds more realistic. I guess the fermentation must have resulted into the floating of the other halve. Because one side is getting bad and other is still fresh.
    I got a good comment from strange---that's the answer to the best of my understanding.
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