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Homework Help: Hydrostatics and fluid mechanics

  1. Jan 18, 2009 #1
    1. The problem statement, all variables and given/known data

    A glass cube of length 2cm and specific gravity=3 is kept suspended via a spring balance and is kept exactly half immersed in water. surface tension of water is 75 dynes/cm. find the reading shown by the spring balance. (contact angle = 0 degree. g=1000cm/sec^2)
    i got 23.8 gm wt but the answer seems to be wrong

    2. Relevant equations

    3. The attempt at a solution
    vol of glass cube = 8cm^3
    vol of the part immersed is 4m^3weight of water displaced = 4*1gm wt
  2. jcsd
  3. Jan 18, 2009 #2


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    Welcome to PF!

    Hi Lorna18! Welcome to PF! :smile:
    You seem to have a surface tension force of 0.2 gm wt …

    how did you get that? :smile:
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