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7. A horizontal pipe with circular cross-section delivers 4 kg of water per second. The diameter of the pipe is 0.10 meter, except at a certain section, where the pipe widens to a diameter of 0.20 meter. Assume that the fluid is non-viscous and incompressible and that the flow is laminar.

a) What is the difference in water pressure between the wide and narrow sections of the pipe?
b) Is the narrow section at higher or lower pressure than the wide section?

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