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Help with question

  • 16-11-2011 08:13PM
    #1
    Big Mouth
    Closed Accounts Posts: 234 ✭✭


    Hi,

    Im doing a course and one of the questions is pasted below. I have no idea about this stuff so if anyone could answer and explain it step by step I would be very grateful!

    A tank contains fuel oil of relative density 0.75 and exerts a pressure of 12 kN/m2 onto the base of the tank. Calculate the depth of fuel that the tank presently holds.


Comments

  • #2
    Delphi91
    Registered Users, Registered Users 2 Posts: 1,501 ✭✭✭Delphi91


    Big Mouth wrote: »
    Hi,

    Im doing a course and one of the questions is pasted below. I have no idea about this stuff so if anyone could answer and explain it step by step I would be very grateful!

    A tank contains fuel oil of relative density 0.75 and exerts a pressure of 12 kN/m2 onto the base of the tank. Calculate the depth of fuel that the tank presently holds.

    Have a look for a formula for the pressure P at a depth h in a liquid of density [latex]\rho[/latex]

    The relative density of a substance is the density of the substance divided by the density of water (which conveniently is 1) so the relative density of the fuel oil is effectively the density of the fuel oil.


  • #3
    MathsManiac
    Registered Users, Registered Users 2 Posts: 1,595 ✭✭✭MathsManiac


    Delphi91 wrote: »
    Have a look for a formula for the pressure P at a depth h in a liquid of density [latex]\rho[/latex]

    The relative density of a substance is the density of the substance divided by the density of water (which conveniently is 1) so the relative density of the fuel oil is effectively the density of the fuel oil.

    Isn't the density of water (in SI units) approximately 1000 kg/(m^3)?

    So the density of the fuel will be 750 kg/(m^3).


  • #4
    Delphi91
    Registered Users, Registered Users 2 Posts: 1,501 ✭✭✭Delphi91


    MathsManiac wrote: »
    Isn't the density of water (in SI units) approximately 1000 kg/(m^3)?

    So the density of the fuel will be 750 kg/(m^3).

    True.

    It was a bit late when I was putting in my post and I was thinking of the density of water as 1 gr/cm^3 which gives the density of the oil in the container as 0.75 gr/cm^3.


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