CP A large tank of water has a hose connected to it (?Fig. P18.59?). The tank is sealed at the top and has compressed air between the water surface and the top. When the water height h has the value 3.50 m, the absolute pressure p of the compressed air is 4.20 X 105 Pa. Assume that the air above the water expands at constant temperature, and take the atmospheric pressure to be 1.00 X 105 Pa. (a) What is the speed with which water flows out of the hose when h = 3.50 m? (b) As water flows out of the tank, h decreases. Calculate the speed of flow for h = 3.00 m and for h = 2.00 m. (c) At what value of h does the flow stop?

Solution 65P Step 1: Here h 1 h v1= 0 p = 420 kpa 1 Here h 2 0 v2= unknown p2= 100 kpa v A = v A 1 1 2 2 v1= (A /2 )1 ~2 (A /A ) << 1 2 1