As Air Flows Through the Horizontal Ductwork in a Warehouse

Multiple Choice

As air flows through the horizontal ductwork in a warehouse, it passes through a fan inside the duct and the air's total energy increases. Since the air's speed doesn't change as the result of going through the fan, you know that the air's

A) kinetic energy has decreased but its pressure has remained the same.
B) kinetic energy has increased but its pressure has remained the same.
C) pressure has decreased but its kinetic energy has remained the same.
D) pressure has increased but its kinetic energy has remained the same.