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Find new density

  1. Dec 10, 2009 #1
    1. The problem statement, all variables and given/known data

    if the original density of a cube is 869 kg/m3 and volume 125cm3.. the cube is is heated to a new volume of 125.00255cm3 whats the new density
     
  2. jcsd
  3. Dec 10, 2009 #2

    rl.bhat

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    When you heat the cube, which quantity remains constant?
     
  4. Dec 10, 2009 #3

    ideasrule

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    Can you tell us what equations you think are relevant and how you've attempted the problem?
     
  5. Dec 10, 2009 #4
    Well i found the new volume first using Change V/V= linear expansion coeffecient(change tmp)... orginal v =125cm3.....Delta V/125=17x10^-6 x 50... Change V=.31875 so the new volume is 125.31875cm^3... but I dont know how to find the new density..d=m/v... would mass not change even though the voume did
     
  6. Dec 10, 2009 #5

    ideasrule

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    Mass doesn't change because the number of atoms in the material doesn't change. So yes, find the mass.
     
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