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Homework Help: Cylindrical Drum of Molasses

  1. Jun 2, 2010 #1
    1. The problem statement, all variables and given/known data
    A cylindrical drum of molasses is 25% full and laying on its side. The dimension sof the drum are 4 ft. height and 1.5 ft. radius. Find the pressure on the circular side (end) of the drum) created by the molasses.

    Weight density of molasses = 100 lb/ft^3


    2. Relevant equations
    pressure = weight density x depth


    3. The attempt at a solution
    Total volume of drum = 9pi ft^3
    Volume of molasses = 2.25pi ft^3

    Thank you!
     
  2. jcsd
  3. Jun 2, 2010 #2

    diazona

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    Homework Helper

    That's it?

    We can't help you unless you make an effort to solve the problem first.
     
  4. Jun 4, 2010 #3
    I wonder if the makers of this problem really want the pressure, or if they want the maximum pressure, or the force on the lid of the drum. The pressure is not constant.
    To find the pressure you have to calculate weight density x depth. Finding the depth
    will be the tricky part.
    If you want to calculate the force, you have to integrate the pressure over the part of the side that's covered in molasses.
     
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