The water enters the two-story building through a horizontal pipe with an inner diameter 4 cm and the

pressure of 10 atm. The velocity of the water ow in the pipe is 5 m/s. The horizontal pipe is connected

to a vertical pipe which leads to bathrooms in each story.

a) What is the velocity of the water ow in the vertical pipe

if the diameter of the pipe is 2 cm.

b) What is the pressure in the pipe in the rst story (point

A)? The vertical distance from the horizontal pipe is 2 m.

c) What is the percentage drop of the pressure in the second

story (point B) from the rst story (point A) if the height

of the story is 3 m.