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.

Question

Quizplus · Accepted Answer

Since the air's speed doesn't change, its kinetic energy remains the same. The increase in total energy must therefore come from an increase in pressure.

As Air Flows Through the Horizontal Ductwork in a Warehouse