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Need help finding the density in this particular problem

  1. Nov 28, 2014 #1
    1. The problem statement, all variables and given/known data
    A particular object weighs 313 N in air and 254 N when immersed in alcohol of density 0.7 g/cm3. What are the volume and the density of the object?

    2. Relevant equations
    D=m/vL

    3. The attempt at a solution
    I found the volume by: 313-254 N to find the actual weight, then I divided it by 9.8 to get it into Kg, then I used the density formula to solve for volume which gave me 8.6L

    So the volume is taken care of! 50% of the problem done :)!

    As for the density, I'm confused because I thought I would just plug in my known values but it doesn't work. Can someone please guide me as to how I would find the density of this object? I greatly appreciate it!
     
  2. jcsd
  3. Nov 28, 2014 #2

    Orodruin

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    Can you show what you do and get when you say "just plug in my values".
     
  4. Nov 28, 2014 #3
    6.02kg from the two forces/ 8.6L that I found out from part a) =D

    but it doesn't :[
     
  5. Nov 28, 2014 #4

    Orodruin

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    Which force represents the total weight of the object? What you are solving for above is the density of the alcohol.
     
  6. Sep 1, 2017 #5
    Can you please solve the second part pleaseee, need it for an assignment thanks
     
  7. Sep 1, 2017 #6

    haruspex

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    Usual forum rules... please post your attempt first.
     
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