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Trying to calculate this?

  1. Mar 2, 2015 #1
    I need some help with a calculation. I am trying to calculate how much steel in weight would be needed to suspend a ball(essentially a balloon) 12in in diameter full of air at 50 ft below sea level, in sea water. I am not the best at physics and I think I have an idea but wanted a good opinion. Does not have to be exact just a good estimation.
     
  2. jcsd
  3. Mar 2, 2015 #2

    russ_watters

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    Staff: Mentor

    Welcome to PF!

    The best way to learn is to learn by doing. So take a shot. Some hints to get you started: do you know the equation for buoyancy? Density of water and steel?
     
  4. Mar 2, 2015 #3
    seawater=1025 kgm3 Steel = 7850 kgm3 and I am not exactly sure which formula to use?
     
  5. Mar 2, 2015 #4

    russ_watters

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    Staff: Mentor

    Use the equation for buoyancy.
     
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