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lost captain

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Thread moved from the technical forums to the schoolwork forums

**TL;DR Summary:**We know that the fluid pressure at the exit of the pipe is Patm but what about before the exit? How can we calculate that pressure using Bernoulli's equation.

Hello everyone. Please help, i'm seriously stuck

When learning about bernoulli's equation there's a classic problem with a tank draining that asks us to calculate the velocity of the fluid at the exit. Like in the picture. We said that st the exit the pressure is 1atm, so what about before that?

What's the pressure at points 1 2 3 4 and 5 as shown in the picture?

(The fluid is ideal, no friction, no viscosity, constant density)

Thanks in advance for spending time in my silly confusion.