Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Fluids Buoyancy

  1. Jan 25, 2006 #1
    A 1-kg beaker containing 2 kg of oil(density = 916 kg/m^3) rests on a scale. A 2kg block of iron is suspended from a spring scale and completely submerged in the oil. Find the equilibruim readings of both scales.

    For the bottom scale, I can find the weight, 29.4 N of the beaker and oil, but I'm not sure how to calculate how much weight the iron block contributes. I know buoyancy force = p*V*g but how would affect the weight on the scale?
  2. jcsd
  3. Jan 25, 2006 #2


    User Avatar
    Science Advisor
    Homework Helper

    HINT: If the liquid pushes up (buoyant force) on the iron what is the reaction force acting on the liquid?
  4. Feb 16, 2008 #3
    any more help? I am working with my daughter trying to solve this.
  5. Feb 16, 2008 #4
    So one more cry for help. How do I calculate the reading on the lower and upper scale given what I know in the problem stated above?

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook