Water Is Flowing in a Horizontal Pipe of Diameter D

question 6

Multiple Choice

Water is flowing in a horizontal pipe of diameter d. If you want to change the diameter of this pipe so that the speed of the water would be half as great as it was, what should be the new diameter?

• A) d/4
• B) d/2
• C) d /
• D) d
• E) 2d

---

Definitions:

Nasal Septum

A structure that divides the nasal cavity into a left and right portion.

Cilia

Hair-like projections from the outside of the cell membrane on some cell types.

Pharynx

The membrane-lined cavity behind the nose and mouth, connecting them to the esophagus, part of the digestive and respiratory systems.

Respiratory Rate

The number of breaths taken per minute, an important vital sign indicating the efficiency of the respiratory system.