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Homework Help: Height of a 91 lbs. gold cube.

  1. Sep 11, 2007 #1
    1. The problem statement, all variables and given/known data
    Determine the height of a 91 lbs. gold cube.

    2. Relevant equations
    I'm not really sure which equations are relevant here... this is an Honors Physics problem for my girlfriend, but she asked me to attempt and I'm in Physics.
    Anyways, I thought of and only found a few I could think to be relevant:
    P= F/A
    And that's all I could really find, or have any knowledge of.

    3. The attempt at a solution
    I first converted the 91 lbs. to kg, making 41.4 kg.
    My thought process on this was that if I could determine the surface area through P= F/A then I could figure out a length of the cube. It being a cube that'd also decide the h height of the cube, thus giving me my answer.
    However, I am stuck.
    Lacking any previous physics knowledge, as my physics class just started last week, I'm not entirely sure on where to take this next.
    I'm asking for a little direction, please.

    Thanks for your time,
  2. jcsd
  3. Sep 11, 2007 #2


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    Homework Helper

    Look up the density of gold.
  4. Sep 11, 2007 #3


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    Staff Emeritus
    Science Advisor

    Do as learningphysics suggested,

    then use volume (of cube) and not surface area. One need not consider pressure.

    See www.webelements.com
  5. Sep 11, 2007 #4


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    Staff Emeritus
    Science Advisor
    Gold Member

    Incidentally, that isn't a conversion: pounds measure force and kilograms measure mass.
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