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Homework Help: Manometer Reading using Fluid Dynamics

  1. Jan 14, 2017 #1
    so I have been working on this problem :

    1. Diameter1 at wide end: 8cm || V1 = 1.56m/s
    2. Diameter2 at narrow end: 3cm || V2 = 11.094m/s

    ***Find the manometer reading***

    [1]: https://i.stack.imgur.com/ZKpT0.jpg

    I know that due to Bernoulli's Equation the pressure where velocity is at 11.094m/s is much lower than at the other end. This can also be seen from the Mercury(Hg) level.

    **I have take P2 as being 0 because it is open to the atmosphere -- I am unsure whether this should be taken as 0 or 1.**

    I have used the following equation to work out P1 :

    P1+(1/2 ρv1^2)=P2+(1/2 ρv2^2) and I end up with P1 = 4.5581(atm??)

    I am still unsure how to proceed in this case. Any help or tips would be appreciated.

    Attached Files:

  2. jcsd
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