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

Need to find WORK

  1. Feb 3, 2009 #1
    Find the work done in emptying a tank containing oil if the tank is hemisphere with a diameter of 6 feet. The tank is full and the density of the oil is 50lb/ft^3. The oil is raised to a point 4 ft about the top of the tank. Thank you for helping. I have no idea how to start.
  2. jcsd
  3. Feb 3, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi idle_09! :smile:
    (i assume you mean "4 ft above …"?)

    work done = change in energy (that's the work-energy theorem) …

    so divide the tank into horizontal slices of thickness dz, calculate the mass of each slice, how much energy is needed to raise it to z = 7, and integrate over z. :wink:
  4. Feb 3, 2009 #3
    you'll have to find the size of a slice of the hemisphere as a function of z... just figured I'd throw that hint out there.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Need to find WORK