1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Pressure in a Tank

  1. Mar 25, 2014 #1
    Hi all, I need some help with this question.

    [​IMG]

    The final answer is 32.7kN but I have no idea what I'm doing cause I'm so lost in this fluid mechanics class right now.

    I attempted to calculate the pressure on the plate.

    P = pgh
    P = 1000*9.8*2
    P = 19600 Pa

    Then I used F = P.A to get 78400N. I know this question has something to do with torque and resolving forces but I'm pretty sure I've already got it wrong. My lecturer provided me with this equation:

    y' = y + I_c/(y*A) and I_c is BH^3/12.

    Will I need to use this as well?

    Thanks in advance. :/
     
  2. jcsd
  3. Mar 26, 2014 #2
    Your value for P is not correct. I would calculate the value of P at different points to see why this is the case.
     
  4. Mar 26, 2014 #3
    Thank you for your reply. I've finally worked it out.

    Using that y' equation, I worked out the location off y' and then determined the amount of torque it placed on the hinge. That then equates to 2*F and after a simple rearragement, I solved the question as we just needed to make F the subject.

    The value of H is actually 1.5m as I was meant to be looking at the centroid.

    Thanks for the tip :)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted