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Math Help - PLz help ! Easy problem , but :S

  1. #1
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    PLz help ! Easy problem , but :S

    Please help solving this math problem ! It's easy , but ... I'm still a noob. :

    Two cylinders A and B have the same shape ( the ratio of the height to diameter is the same for both ) , but cylinder A has twice the volume of cylinder B .
    Quests :
    a - Show that the ratio of the diameter of A to the diameter of B is

    b - Show that the height of cylindre A is roughly 26% greater than the height of cylinder B .

    c - Show that the diameter of cylinder B is roughly 79% of the diameter of cylinder A .

    d - If the diameter of cylinder B is 151 mm , then find the diameter of A .

    Thank u so much in advance !!!
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  2. #2
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    erm... I'm not entirely sure on this but I can only do a I think
    so A:B
    the volume of A is twice as much of the volume of B
    so lets put "V" as the volume
    so we have:

    A:B
    2V:V
    And volume is a "cubed" measurement (ie. ^3)
    and the question is asking for the diameter which is a length measurement (ie. ^1), this means that we have to "cube root" the equations

    so we obtain
    cube root 2:1
    which is cube root of 2 as the answer says
    (if you wonder why the V has gone, that's because its a cubed measurement so when it is cube rooted it goes to 1, and cube root 2 x 1 = cube root 2)

    PS
    I'm not entirely sure of this so don't count it as definate
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  3. #3
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    Quote Originally Posted by speed01 View Post
    Please help solving this math problem ! It's easy , but ... I'm still a noob. :

    Two cylinders A and B have the same shape ( the ratio of the height to diameter is the same for both ) , but cylinder A has twice the volume of cylinder B .
    Quests :
    a - Show that the ratio of the diameter of A to the diameter of B is

    b - Show that the height of cylindre A is roughly 26% greater than the height of cylinder B .

    c - Show that the diameter of cylinder B is roughly 79% of the diameter of cylinder A .

    d - If the diameter of cylinder B is 151 mm , then find the diameter of A .

    Thank u so much in advance !!!
    Hello,

    I've attached a screenshot of the calculations
    Attached Thumbnails Attached Thumbnails PLz help ! Easy problem , but :S-zweizylinderglform.gif  
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  4. #4
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    earboth BIG BIG THANKS !!!!!!!!!
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