Conceptual question: Atmospheric pressure

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SUMMARY

The discussion centers on the application of Bernoulli's equation to a stream of water flowing from a faucet into a sink. The initial velocity of the water is 2.0 m/s, and the calculated velocity at the bottom of the sink is 2.81 m/s. Participants clarify that atmospheric pressure influences both the top and bottom of the water stream, ensuring equilibrium in the system. The inquiry also raises a question about the inclusion of kinetic energy in the Bernoulli equation, which is addressed through the understanding of pressure dynamics.

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Students studying physics, particularly those focusing on fluid dynamics, as well as educators and professionals seeking to deepen their understanding of pressure effects in fluid systems.

johnj7
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Homework Statement


A stream of water flows vertically downward at a speed of v1 = 2.0 m/s from a faucet of cross sectional area A = 0.5 cm^2 to the bottom of a sink a distance h = 20 cm below.

Homework Equations


Bernoulli's
P(atm) + (rho)gh = P(atm) + 0.5(rho)v^2


The Attempt at a Solution


solution v = 2.81 m/s

I understand how to get the velocity at the bottom, but I was just wondering why atmospheric pressure acts on both the top and the bottom. I can grasp how atmospheric pressure acts on the bottom of the stream, but how does it act on the top of the stream?
 
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sorry but can anyone answer / help me out?


bump (is this allowed?)
 
Shouldn't there be a kinetic energy term on the left-hand side of the equation?
 

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