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

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  1. bajoneswadup


    Mar 26, 2011
    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
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  3. SaintJude


    Jan 4, 2012
    Bernoulli, pressure straight up related to velocity bro, super impertanto --check it out ;)
  4. bajoneswadup


    Mar 26, 2011
  5. syoung

    syoung MS-3 5+ Year Member

    Jan 2, 2011
    Over the rainbow
    don't pressure me, bro!
  6. SaintJude


    Jan 4, 2012
    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.
  7. milski

    milski 1K member 5+ Year Member

    Dec 30, 2009
    Where the rain grows
    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.
  8. Tatiana3325

    Tatiana3325 Banned Banned

    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.

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