Water flows smoothly through a pipe with various circular cross-sections of diameters 2D, 6D, and D, respectively.  -Part (a)  In which section is the volume flow rate largest? Choose the best answer.  Part (b)  In which section is the speed of the water largest? Choose the best answer.   Part (c)  What is the ratio of the speed in section 3 to the speed in section 1?  Part (d)  In which section is the pressure largest? Choose the best answer.

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Variation of pressure

From the equation of pressure, pressure is directly proportional to the applied force.