A Water Pipe Must Deliver at Least 10 Litres Per

Multiple Choice

A water pipe must deliver at least 10 litres per second to a water tank on a property on the outskirts of a country town. The pipe will have to be 2 km long, and is fed by the town water supply which delivers a pressure difference of 100 000 Pa. What is the minimum radius this pipe needs? The viscosity of water is 0.001 Pa s.

A) 1.0 cm
B) 1.6 cm
C) 3.5 cm
D) 2.7 cm
E) 15 cm
ANS