Problem A6:
An incompressible fluid of density ρ is flowing from left to right through the tubes
shown below. The speed entering on the left is v_{0}, and the
diameter on the left is n_{1}. The diameter on the right is
n_{2}. If the difference in pressure from the left to the
right side is Δ P = P_{1} - P_{2} = n_{3} ρ
v_{0}^{2}/2, what is n_{3}? Note that n_{1}
and n_{2} have the same units of length, and that n_{3} is unitless.

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