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: Pressure of a liquid in a vat

  1. Sep 17, 2006 #1

    jkb

    User Avatar

    A 1.90 m-diameter vat of liquid is 2.70 m deep. The pressure at the bottom of the vat is 1.30 atm. What is the mass of the liquid in the vat?

    I found the density of the fluid but now I'm stuck and I really cant get my mind around this even though i know its going to turn out being so easy...thanks the help in advance!
     
    Last edited: Sep 17, 2006
  2. jcsd
  3. Sep 18, 2006 #2

    andrevdh

    User Avatar
    Homework Helper

    Density is given by

    [tex]\rho = \frac{m}{V}[/tex]

    so you need to determine the volume of liquid in the vat.
     
  4. Sep 18, 2006 #3

    jkb

    User Avatar

    Well, since a vat can isn't necessarily a cylinder how would I go about doing that? I tried to assume the vat was a cylinder and found that volume but the answer wasn't correct.
     
  5. Sep 18, 2006 #4
    why do you say that? what makes you think it is not a cylinder?
     
  6. Sep 18, 2006 #5

    jkb

    User Avatar

    Well i used the volume of a cylinder formula and found the volume and then using the density i found the mass but that answer was incorrect and i dont think i made any mistakes in the calculation so that's where i got stuck...
     
  7. Sep 18, 2006 #6
    oops, nevermind me
     
    Last edited: Sep 18, 2006
  8. Sep 18, 2006 #7
    well the problem stated that there was a diameter and a depth IE an cylinder. can you show us your work?
     
  9. Sep 19, 2006 #8

    andrevdh

    User Avatar
    Homework Helper

    It is not really sensible to talk of a diameter if it changes. Unless there is a mathematical formula for calculating the volume of such a vat shaped object.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook