Fluid mechanics question and the Bernoulli Equation

[Franklie001]

Homework Statement

Fluid mechanics question and Bernoulli Equation

Relevant Equations

Q2 and Q3

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Good afternoon,

I am struggling to find the solution at Q2 and Q3. For Q2 the absolute pressure at point 1 is at the bottom of the tank, so do i need to use the formula P=Patm+qgh ? If using this formula I've got a bigger number than 100Pa.
Same issue for Q3, isn't the pressure at point 2 equal the one at point 1, being at the same height? The question mention that the answer should be within 500 Pa.

Thank you

 

[BvU]

I am struggling to find the solution at Q2 and Q3

I suppose Q2 is in the first picture ?
I find it a struggle to even read the questions in the second picture. Can you type them out ? At least Q3 ?

If using this formula I've got a bigger number than 100Pa

Yes, 10⁵ + $\rho g \Delta h\$ is a lot more than 100. Is your answer not accepted ? I get the same. I resent that the dumb computer doesn't see units.

I also get the same for Q1 (almost : 16.27 kg/s)

Please post your work.

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[Chestermiller]

The pressure at point 2 is not equal to the pressure at point 1. At point 2 (immediately inside the pipe) the velocity has built up in the approach to to the pipe (within the tank) from zero at point 1 (and other locations at the bottom significantly removed from the pipe entrance) to full pipe velocity at point 2. So the pressure at point 2 is significantly lower than at point 1.

 

[BvU]

Hello Chet ! You apparently have been able to read Q3. But OP asks about Q2 (which is legible) as well.

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