Water flows through a pipe that widens out to double its original diameter. How does the speed of water change in the area with the wider cross-section?
A)The speed doubles.
B)The speed increases by four times.
C)The speed decreases by four times.
D)The speed decreases by two times.

Question

Quizplus · Accepted Answer

According to the principle of continuity for incompressible fluids, the flow rate must remain constant. When the diameter doubles, the cross-sectional area increases by four times (since area is proportional to the square of the diameter). Therefore, the speed of the water decreases by four times to maintain the same flow rate.

Water Flows Through a Pipe That Widens Out to Double