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## Homework Statement

Water at 20°C flows through a capillary tube with an inside radius of 0.17 mm and a length of 5.9 cm. If the volume flow rate through the capillary is 1.9 cm3/s, what is the pressure difference between the two ends of the capillary? Give your answer in kPa. The viscosity of water at 20°C is 1.0 x 10-3 Pa s.

## Homework Equations

P(1) + 1/2pv^2 = P(2) + 1/2pv^2

(p1-p2) = 1/2pv2^2-1/2pv1^2

## The Attempt at a Solution

i tried using the second equation for difference in pressure but what i get is zero which is unfortunately wrong. Aside from that, using the bernouli's equation number 1 requires for variables i don't have.