About the ads

  1. Check out PREMED.me!
    Offers FREE service to help premeds manage their applications and MCAT study calendars and identify schools to target.

Bernoulli's

Discussion in 'MCAT Study Question Q&A' started by bajoneswadup, Apr 16, 2012.

  1. SDN is a nonprofit organization. Services are made possible through the generous support of SDN members and sponsors. Thank you.
  1. bajoneswadup

    bajoneswadup

    Joined:
    Mar 26, 2011
    Messages:
    147
    Status:
    Pre-Medical

    SDN Members don't see this ad. (About Ads)
    Ok I know there's thousands of threads like this, but my physics
    prof skipped fluids, so will somebody tell me that I'm correct.

    Ok in a closed system only relate area w/ the velocity b/c flow rate
    is constant Q=av. Then I relate the velocity to the pressure w/ Bernoullis's. This is the typical thought process right?

    In an open system if P increased V can increase too, but in a closed system they're inversly related. Do I need to know anything else about Bernoulli's, like the v is squared? Or am I straight?

    Also, how do I know when to apply Poiseuille's law vs q=av?
    Last edited: Apr 16, 2012
  2. SaintJude

    SaintJude

    Joined:
    Jan 4, 2012
    Messages:
    1,488
    Status:
    Pre-Medical
    Bernoulli, pressure straight up related to velocity bro, super impertanto --check it out ;)
  3. bajoneswadup

    bajoneswadup

    Joined:
    Mar 26, 2011
    Messages:
    147
    Status:
    Pre-Medical
    Hahaha
  4. syoung

    syoung MS-1

    Joined:
    Jan 2, 2011
    Messages:
    881
    Location:
    CA
    Status:
    Medical Student
    SDN 2+ Year Member
    don't pressure me, bro!
  5. SaintJude

    SaintJude

    Joined:
    Jan 4, 2012
    Messages:
    1,488
    Status:
    Pre-Medical
    Ok, now in all seriousness, the most important relationship from Bernoulli is that as velocity increase, pressure decreases. Also I pm'd you a good source for more info.
  6. milski

    milski 1K member

    Joined:
    Dec 30, 2009
    Messages:
    2,393
    Location:
    Where the rain grows
    Status:
    Pre-Medical
    SDN 2+ Year Member
    I think you're ok.

    Poiseuille's law and q=av are not contradictory. The former gives you the pressure difference along a pipe for a non-ideal, viscous fluid. q=av just relates the velocity and the flow at a specific cross-section of the pipe. It will be correct for any non-compressible fluid.
  7. Tatiana3325

    Tatiana3325 Removed

    Joined:
    Apr 4, 2012
    Messages:
    5,665
    Location:
    Winter of our discontent
    Status:
    Pre-Medical
    Bernoulli's equation:
    Where 1. Points one and two lie on a streamline, 2. The fluid has constant density, 3. The flow is steady, and 4. There is no friction

    Fluid= gas or liquid

    Increase in fluid speed results in decrease of internal pressure. And vice versa.

Share This Page


About the ads