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Homework Help: Finding density of a sphere and percentage error

  1. Sep 3, 2010 #1
    1. What is the Density in g / mL of a sphere with a diameter of 4 cm and a mass of 1.35 grams?

    What is the percent error if the actual density of the sphere was 7.87 g / mL?

    2.Volume= 4/3 x pie x r cubed
    Density= mass/volume
    percentage error= result minus accepted divided by acceptd multiplied by 100

    3. 4/3 x pie x 2 (cubed) =33.510
    1.35/33.510= .040
    .040-7.87/7.87 x 100= -99.50
  2. jcsd
  3. Sep 4, 2010 #2
    Carry the units through in your calculation to make sure they match the desired units, in this case you will want to end up with a density expressed in g/mL. Notice that the units you end up with in your calculation for density is g/cm^3. Hope this helps.
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