4. (20 pts) A very large tank filled with water to a height of 15.0 m has a top that is open to the air. There is a narrow horizontal pipe connected to the bottom of the tank. (The diameter of this pipe is very small compared with the diameter of the tank.) This pipe then narrows further so that its cross-sectional area in the second section is exactly 1/2 of what it is in the first section. In this second section, the water is at atmospheric pressure, 1.01 x 10 Pa. (a) What is the speed of the water in the narrower, second section? (b) What is the pressure of the water in the first, less narrow section of the pipe? (c) What is the height of the water in the vertical pipe attached to the first section? It is also open to the air at the top. 15.0 m QY 3%e&9) Seetion L Sectionl