Water flows upward at constant speed through a vertical pipe of uniform diameter that…
PHYSICS · Single correct · CBSE · Physics · Mechanical Properties of Fluids · Mechanical Properties of Fluids
Problem
Water flows upward at constant speed through a vertical pipe of uniform diameter that rises 4.0 m from an underground main to a faucet open to the atmosphere. Which statement best describes the pressure at the pipe’s entrance compared with the pressure at the faucet?
(a) It is the same, because the speed of the water is the same at both locations.
(b) It is higher by ρg(4.0m), because the water must gain gravitational potential energy to reach the faucet.
(c) It is lower by ρg(4.0m), because gravitational potential energy decreases as the water rises.
(d) It is higher only if the pipe narrows; otherwise the pressures are equal.