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4) (25 points) A cylindrical tank with a diameter of 0.5 m contains water at an initial level h-1.0 m, as shown in the picture. Water comes out from the port A with a diameter of 0.01 m. The average velocity of the water flow at the port A can be described by the equation V = 2gh, where g is the gravity (g = 9.81 m/s) and h is the height of the water. a) (5 points) Please determine the initial velocity of water at the port A (t = 0 and h - 1.0 m). b) (20 points) Please determine the time that is needed to drain half of the water in the tank (h decreases from 1.0 m to 0.5 m). 0.5 m h V = 2gh 0.01 m