1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Buoyant force

  1. Mar 19, 2016 #1
    1. The problem statement, all variables and given/known data
    why there is - sign in front of integral of (z2-z1)dA , is it a mistake ?

    2. Relevant equations

    3. The attempt at a solution

    Attached Files:

    • 124.PNG
      File size:
      17.7 KB
  2. jcsd
  3. Mar 19, 2016 #2
    In your picture, they define the height of the volume element (a positive number) as z1-z2. This means that z1 must be the larger number. I'm guessing that they must be thinking of z=0 as the surface of the fluid, making z1 and z2 negative numbers....so they have the negative sign out front to make the force act in the positive z direction. Just a guess anyway.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Discussions: Buoyant force
  1. Buoyant forces (Replies: 12)

  2. Buoyant Force (Replies: 2)

  3. Buoyant Force (Replies: 5)

  4. Buoyant force (Replies: 7)

  5. Buoyant Forces (Replies: 5)