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The figure below shows four arrangements of pipes through which water flows smoothly toward the right. The radii of the pipe sections are indicated. In which arrangements is the net work done on a unit volume of water moving from the left most section to the rightmost section (a) zero (b) positive and (c) negative? The horizontal venturi tubes shown below have three sections with different radii. Which of the following is TRUE about the manometer readings? Water flows at a constant speed of 16 m/s through narrow section of the pipe. What is the speed of water in the section of the pipe where its radius is twice of the initial radius? 16 m/s 12 m/s 10 m/s 8 m/s 4 m/s