試題詳解

39. A large tank of water has a hose connected to it. The tank is sealed at the top and has compressed air between the water surface and the top. When the water height h is 3.5 m the pressure of the compressed air is 4.0 x 10⁵ Pa. Take the atmospheric pressure to be 1.0 x10⁵ Pa. What is the speed of the water when it flows out of the hose if h is 3.5 m?
(A) 30.8 m/s
(B) 28.4 m/s
(C) 26.8 m/s
(D) 25.5 m/s
(E) 23.4 m/s